|Publication number||US2297691 A|
|Publication date||Oct 6, 1942|
|Filing date||Apr 4, 1939|
|Priority date||Apr 4, 1939|
|Publication number||US 2297691 A, US 2297691A, US-A-2297691, US2297691 A, US2297691A|
|Inventors||Chester F Carlson|
|Original Assignee||Chester F Carlson|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (768), Classifications (33) |
|External Links: USPTO, USPTO Assignment, Espacenet|
US 2297691 A
Oct. s, 1942. F, CARL-50N 2,297,691
-ELECTROPHOTOGRAPHY Filed April 44. 1939 INVENTOR Patented Oct. 6, 1942 i UNITED STATES PATELNT FFICE.
ELECTROPHOTOGRAPHY Chester F. Carlson, Jackson Heights, N. Y.
Application April 4, 1939, Serial No. 265,925
This invention relates to photography.
An object of the invention is to improve methods of photography and to provide improved means and devices for use in photography.
Other objects of the invention will be apparent from the following description and accompanying drawing taken in connection with the appended claims.
The invention comprises the features of construction, combination of elements, arrangement of parts, and methods of manufacture and operation referred to above or which will be brought out and exemplified in the disclosure hereinafter set forth, including the illustration in the drawing.
In the drawing:
Figure 1 is a section through a photographic plate according to my invention and illustrates a preferred method of applying an electric charge to it preparatory to photographic exposure;
Figures 2, 2a and 2b illustrate three methods of photographically exposing the plate;
Figures 3 and 4 show a method of developing the electrostatic latent image produced on the plate by the preceding steps;
Figure 5 shows a method of transferring the image to a sheet of suitable material such as paper;
Figures 6 and 'l illustrate methods of fixing the image onto the sheet;
Figure 8 illustrates a modified means for charging and exposing the photographic plate;
Figure 9 shows another method of developing the image; and
Figure 10 is an enlargement of a half-tone produced by the process.
A feature of the present invention resides in the use of photoelectric or photoconductive materials for photographic purposes. In its preferred form the invention involves the use of materials which are insulators in the dark but which become partial conductors when illuminated. These materials respond to light, being slightly conductive whenever they a-re illuminated and again becoming insulating when the light is cut off. They can be called photoconductive insulating materials.
In carrying out the invention the photoconductive insulating material is used to control electric charges in such a way as to produce an electrostatic latent image (so named by its analogy to the ordinary photographic latent image). The electrostatic latent image is then developed to make a visible picture as will be more fully described in the following detailed specification.
While a preferred embodiment of the invention is described herein, it is contemplated that considerable variation may be made in the method of procedure and the construction of parts without departing from the spirit of the invention. In the following description and in the claims, parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts as the art will permit Referring to the drawing Figure l shows a cross-section of a photographic plate 2E] according to the invention comprising a thin layer 2l of photcconductive insulating material bonded to a metal plate 22.
Any one of a variety of photoconductive insulating materials may be used for layer 2i. Following are a few of the materials which I have found suitable: (1) sulfur, (2) anthracene, (3) anthraquinone, (4) melted mixtures of sulfur and selenium with the sulfur predominating, (5) melted mixtures of sulfur with up to a few percent of anthracene, (6) the compound formed by heating and melting together sulfur and anthracene in proportions of about 1 part sulfur to three parts anthracene by weight, the heating being continued until reaction is complete, (7) linseed oil boiled with sulfur and dried in a thin layer.
Other photoconductive materials having insulating characteristics in the dark may also be used.
The plate 22 may be of almost any suitable metal which does not deleteriously react with the photoconductor used. Zinc or aluminum plates are suitable for sulfur and anthracene layers. Brass may also be used. The surface of the metal may be etched to improve the adherence of the photoconductive layer.
Sulfur coated plates may be prepared by placing a few crystals of pure sulfur onto the etched surface of the metal plate and heating the plate until the sulfur melts, then flowing the sulfur uniformly over the surface of the plate and allowing any excess to run oif, and cooling the plate to solidify the layer. If desired the layer can be made thinner and smoothed with fine emery paper after it has solidified, finishing with a polishing powder such as chalk.
Anthracene and anthraquinone coated plates may be made by melting the material onto an etched metal plate and quickly cooling the plate in cold water, whereby a thin glossy layer is obtained on the plate. However, due to the strong tendency of these materials to sublime or evaporate when heated to their melting point it is necessary to provide a cover spaced slightly from the metal plate so as to preserve a nearly saturated vapor atmosphere adjacent the surface.
Another method is to cover a shallow dish containing anthracene or anthraquinone with a metal plate and heat to evaporate the material and condense it onto the metal plate, the heating being continued until the material sinters or fuses to the metal plate, the assembly then being allowed to cool slowly.
The other materials can be made into layers by melting or spreading onto suitable surfaces, the procedure in each case depending upon the nature of the material used.
The materials described above are all insulators. Sulfur, for example, is one of the best insulators known. However, all of the materials are of insulating character. For example, if any of them is made into a thin layer and an electric charge is applied on one side of the layer it will be substantially prevented from passing through the layer to the other side while the layer remains unilluminated. Hence such layers will hold an electric charge for a length of time sufficient for the production and utilization of an electrostatic latent image as described herein.
These photoconductive insulating materials are to be distinguished from the semi-conductors commonly used in photoelectric cells, such as cuprous oxide or the metallic variety of selenium. 'Ihe semi-conductors, while of better conductivity in the light than in the dark, will not hold an electrostatic charge on their surface even in the dark. This can be demonstrated by frictionally rubbing the surface of one of these semiconductors with a cloth or brush and then immediately dusting the surface with an electroscopic powder, such as lycopodium powder. None of the powder will adhere by electrostatic attraction, indicating that any charge developed by rubbing has immediately drained olf through the layer.
Of the insulating materials, anthracene appears to have the highest photoelectric conductivity when exposed to incandescent light, such as the 4light from an Eastman Photofiood lamp. Anthraquinone and sulfur appear to be next in sensitivity in the order named. However, the sensitivity varies with the wave length of the light source used. Sulfur, for example, has its maximum sensitivity at about 4700 Angstroms, that is, in the blue-violet part of the spectrum. Anthracene appears to have greater sensitivity to rays in the region of the wave length of green light. Other materials may be more conductive under ultra-violet radiation,
The layers should preferably in all cases be made quite thin, such as in the order of a thousandth to a few hundredths of an inch thick. Thicker layers may sometimes be used, it being preferable, however, to have the layer thin enough to allow light to penetrate entirely through the layer during exposure.
The layer may be continuous and glassy in appearance or may be somewhat crystalline in nature. Or it may be discontinuous-that is, made up of a multiplicity of tiny individual areas of photoconductive insulating material, or the material may be formed into a more or less porous or pitted layer.
Having discussed the nature and production of my novel photoelectric photographic plates we may again refer to Figure 1 and the succeeding figures for an understanding of a preferred method of carrying out my photographic process. In this preferred method the surface of the photoconductive insulating layer is first charged by rubbing it vigorously with a soft material such as a cotton or silk handkerchief 23 as indicated in Figure l. A soft brush or a fur may also be used. The layer should be rubbed in the dark so that it will be at its highest insulating value and hence will retain the charge uniformly distributed on its surface. In some cases, however, where photoelectric materials of low sensitivity are used it will be suicient to work in subdued light, total darkness not being required. By rubbing the surface of the layer vigorously in the manner described a strong and uniformly distributed electric charge is developed at the surface and remains held on the insulating surface while the layer is kept in comparative darkness. Since the backing plate 22 is ordinarily grounded by contact with other surfaces there will exist a high potential difference between the charged surface and the plate resulting in a strong electric field through layer 2l.
The layer is now immediately exposed to the light image or pattern which it is desired to reproduce, Figures 2, 2a and 2b show three alternative methods of exposure.
According to Figure 2, for example, the plate 2@ is secured in position in the back of camera 2Q whereby the image of the original 25 is focussed on the layer 2 I. The exposure may require from a few seconds to two or three minutes depending on the sensitivity of the layer used and the intensity of illumination. Original 25 may be a sheet of paper carrying printed or typewritten matter, or a drawing, for example, although other things may be photographed such as 3- dimensional objects, for example.
The sources of illumination are illustrated as incandescent lamps 26, although other sources (such as sunlight or ultra-violet lamps) may also be used depending on the character of the object to be illuminated and the wave lengths at which the layer 2l has the greatest response.
By the exposure, the parts of the layer 2| which are illuminated by the image are, for the time during which they are illuminated, rendered more conductive. This allows the electric charge, which has been held on the front surface of the layer to drain off the illuminated areas of the layer through the layer to the metal plate 22. During exposure the unilluminated areas (such as black letters corresponding to printing on original sheet 25) retain their charge or a substantial part of it throughout the exposure period, Thus, the electric charge will remain where there are black areas in the picture and will be drained off the white areas.
There is thus obtained on layer 2l an electrostatic latent image corresponding to the drawing, printing or other configuration on the original 25.
Figure 2a illustrates another method of exposure suitable for use where the original is a transparency such as an ordinary photographic film, or a translucent material such as tracing paper or ordinary paper carrying an image in the form of opaque or semi-opaque lines or areas. The original 21 carrying the image 28 on its surface is placed against the surface of layer 2l and the assembly exposed to light from source 26. Exposure for a fraction of a second up to a few seconds will ordinarily be suflicient.
Ordinary drawings and typewritten letters may be copied in this way.
Figure 2b shows a method for use where the original is recorded on a small film or lantern slide 30, e. g. microfilm or motion picture film. In this case the original is placed in a projector 29 which projects the image on layer 2|.
In any of the exposure methods illustrated the time of exposure may preferably be so regulated that the most brightly illuminated areas will lose somewhat less than its entire charge and the areas which are illuminated only half so brightly will lose less of their charge, such as approximately half of it.
This may be better understood by considering each infinitesimal area of layer 2l as a charged condenser with its plates connected together through a resistance. Each condenser-resistance combination is in parallel with a large number of other condenser-resistance combinations having various resistance values. The discharging curve (charge vs. time) of a condenser through a resistance slopes downward from maximum charge and then iiattens out so as to approach asymptotically the horizontal line representing Zero charge. The slopes of the curves for different elements will vary but they all approach Zero charge. Hence, if exposure is continued for too long all areas will become discharged and very little contrast will be obtained. It is preferred, therefore, that the exposure be stopped while the discharging rate is still on the steeper part of the charge vs. time curve. The time may, of course, vary from a fraction of a second to several minutes depending upon the characteristics of the photoelectric material and the intensity of light. Moreover, where the contrast on the original is high, such as black lines on a white background, the exposure time is not critical.
Having exposed the plate in one of the manners shown in Figures 2, 2a and 2h so as to produce an electrostatic latent image thereon, the image may be developed or made visible as shown in Figures 3 and 4. The exposed plate is removed from the camera or other exposure device in a dark or dimly lighted room and laid face up on a table where it is sprinkled with a fine dust or powder Si from a can 35. having a cloth or fine wire screen 33 closing its mouth (see Figure 3). Almost any kind of powder can be used depending on the effect desired in the nished print. Pulverized resins of all varities are very satisfactory, the kind being preferred which can be melted or made adhesive by heating. I have successfully used finely pulverized gum copal, gum sandarac, ordinary rosin, sealing wax, cumarone-indene resin, the treated pine resin sold under the trade-mark Vinsol resin, and various other synthetic and natural resins. I-Iard waxes capable of reduction to powder are also suitable. Likewise such diverse materials as dyed lycopodium powder, talcum powder, sulfur, minium, carbon dust and aluminum bronze powder have been used successfully. Powdered dyes may also be used, or the resin or other powder used may be dyed any color desired. For example, Vinsol resin or gum copal may be melted with a small proportion of nigrosine dye, cooled and pulverized to give a dark colored powder.
It may sometimes be of advantage to use a powder in which the individual granules are generally spherical in shape since this appears to contribute to a more accurate distribution of the Fill powder according to the electric charge on the layer. Lycopodium powder is naturally of a generally spherical shape. The resins or waxes can be made into a spherical powder by spraying the molten resin or wax from an atomizer into a cold chamber in which the spherical droplets will harden before coming into contact wtih other particles. Another method is to sprinkle the pulverized resin or wax through a heated zone where the particles momentarily melt and assume a rounded form and then harden.
The dusted plate is then subjected to a gentle draft of air by blowing the breath on it or directing the air from the nozzle of a suitable blower 34 against the dusted surface to blow olf all loose powder not held on the surface by electrostatic attraction (Figure 4).
Wherever an electric charge remains on the surface, corresponding to the dark parts of the original image, the powder remains adhering to the surface by electric attraction, thus developing and making visible the picture 35 on the surface formerly present as an electrostatic latent image.
In some cases the dusting and blowing olf of the layer may be performed in one step by blowing the dust against the layer with a draft of air from a dust atomizer or other blower device. Likewise the dust may in some cases itself be given an electrostatic charge by friction or by discharging electricity through it, the sign of the charge preferably being opposite to that on the electrostatic latent image to improve the adherence of the powder. If the charge is of the same sign a negative image will result i. e. the powder will not deposit on the charged areas of the layer but will deposit on the uncharged areas.
In any case the visible image produced by the dust deposit can be xed or made permanent in one of several ways depending on the type of powder used and the result desired.
If it is desired to apply the image to paper, metal foil or other sheet material, for example, the procedure of Figure 5 may be followed. According to this method the sheet material 35 is carefully laid on the surface of layer 2| carrying the dust image 35 and is firmly pressed against the surface by a block 3'! carrying felt or sponge rubber pad 33. This will transfer a part of the powder to the surface of the sheet material, making the image visible thereon. In order to improve the transfer it is preferred to apply an adhesive to the surface of sheet 36 prior to the making of the transfer. Plain water or other liquids are often satisfactory, especially with paper sheets. Wax, parafn or other soft or sticky substances also may be used.
Where the powder cr dye used is soluble or partly soluble in water or other liquid and the liquid is used to wet the sheet prior to transfer the image will become permanent on the sheet as soon as the liquid evaporates, thus resulting in a finished ccpy.
Where wax or other soft or sticky substance is used the powder will in some cases be sufciently embedded by pressure to produce a fairly permanent print.
he preferred method of fixing the image is shown in Figure 6, however. This method is suitable where a resin or wax powder is used in the dusting process or where the sheet 36 is coated or impregnated with resin or wax prior to transfer of the image. According to this method the sheet 36 is heated momentarily to a temperature at which the resin or wax will melt or become adhesive thereby permanently aiixing the image to the sheet. The heating may be accomplished b-y a heat radiating electric resistance element 39, for example, as shown in Figure 6.
Figure 7 shows another method of fixing the image which comprises spraying the surface of the sheet 36 carrying the dust image with a xative lacquer by atomizer 40.
From the preceding description certain advantages of my process over ordinary photographic methods will be apparent. In the rst place the process yields a direct positive copy, instead of a negative. That is, upon exposure to the original and then dusting with a black or colored powder and transferring to a white sheet of paper, the areas which appeared dark on the original will be reproduced as black or colored areas on the copy, and the areas which were white on the original will also be white on the copy.
Another advantage is that the process yields directly readable copies of written or printed matter with the use of an ordinary camera lens or by contact printing with the printed side against the sensitive plate, rather than yielding a mirror image. This makes the process especially well adapted to direct reproduction of printed matter, drawings, typewritten matter and the like. For instance, if it is desired to reproduce a typewritten letter it may be copied either with the camera, as shown in Figure 2, or by contact printing as shown in Figure 2a, and the finished copy 36 (Figure 6 or 7) will be an exact black-letters-on-white-background duplicate of the original letter.
Figure 8 shows another method of charging the surface of photo-conductive insulating layer 2l. In this arrangement a transparent plate 4| coated with a transparent sputtered metal layer 42 is placed parallel to layer 2'I near its surface with the metal layer 42 nearest the layer 2i. Metal lm 42 and metal backing plate Z2 are connected to the opposite potential terminals 43, 44 of a high voltage source d5. Source 45 may be any suitable high voltage supply such as a multi-cell battery, an electrostatic generator or a transformer-rectifier system. I have found a transformer-rectifier circuit delivering about 1300 volts D. C. to be suitable.
The layer 2l is illuminated uniformly, as by lamp 45, while the voltage source is connected. This allows a charge to now to the front surface of layer 2|. the voltage source disconnected a charge will remain on layer 2 I. The plate 20 may now be exposed photographically as previously described.
According to another method the layer may be charged as just described, for example by connecting the positive terminal of the source i5 to the plate 22 and the negative terminal to layer 42, resulting in a positive charge on layer 2 I The lamp 46 is then extinguished and the assembly is exposed to an image projected thereon by lens t1. At the same time the connections to the source d are reversed. The result is that the areas on layer 2| which are illuminated by the image will discharge their positive charge and then become negatively charged from the voltage source. This will result in an electrostatic latent image in which the light parts of the image are negatively charged and the dark parts of the image positively charged.
If a dusting powder is used for the above layer If the lamp is now turned off and which already has a negative charge (due to fric tion) the dust particles will attach themselves strongly to the positively charged areas of the image and be repelled from the negative areas, thereby forming a very sharp image.
By another method of using the arrangement of Fig. 8 the first charging step is eliminated and the layer is charged during emosure to the image (by lens 41) resulting in an electrostatic latent image in which the light areas of the image are charged instead of the unilluminated areas. If such an image is dusted with black powder the result will be a negative instead of a positive. If it is dusted with a white powder and the powder image is transferred to a black background a positive will result. If desired, a thin sheet of insulating material may be interposed between layers 2l and 42 in Figure 8, instead of an air space.
In the dusting process, instead of applying the powder to the surface of layer 2| a thin sheet of insulating material 48 may be laid on top of the layer 2l carrying an electrostatic latent image and the powder deposited on the surface of sheet d8 as shown in Figure 9. The dust will then adhere to layer 48 opposite to the charged parts of layer 2l.
My process may also be adapted to the production of masters for the making of multiple copies by lithographic or typographical methods.
Lithographie reproduction For production of masters for offset lithography the rst steps in the process may be the same as described in connection with Figures 1 to 4, inclusive. However the dusting powder must be selected to be a material which is wetted by lithographic ink. Many of the resins mentioned are suitable for this purpose, such as copal, sandarac, VinsoL and rosin as well as the hard waxes. While these are ordinarily satisfactory it may in some cases be preferred to compound the resin with a small amount of lithographic crayon material or to add some fatty acid or fatty material to improve the adherence of the image to the lithographic plate.
After the dust image is formed on the electrophotographic plate as already described it is transferred as illustrated in Figure 5, but in this case the sheet 36 is a lithographic sheet such as a specially prepared etched aluminum or Zinc plate of the type commonly used for offset lithography. The newly-developed paper or parchment-like lithographic sheets known commercially as Duplimat sheets (for use on the Multilith machines) can also be used.
The resin or wax image is melted onto the sheet by heating as shown in Figure 6. Any number of copies can then be produced from such a sheet by oifset lithography, the lithographic ink adhering to the letters but not to the background, when the sheet is wetted with water.
According to another method the lithographic plate, preferably etched aluminum or zinc is coated with a thin layer of anthracene (or anthraquinone) to produce an electro-photographic plate, by one of the coating methods already described. The layer is then exposed and dusted with resin dust as previously described.
Then the plate is heated carefully to a temperature at which the anthracene evaporates off leaving the resin image on the plate. If the resin has already melted it is merely necessary to cool the plate to solidify the resin image onto the surface. If the resin is of a higher melting point the heating is continued until the resin melts. This method has the .advantage that all of the resin which becomes attached to the electrostatic latent image is utilized in the finished lithographic plate. In this process it may be necessary to use a photostat camera having a 45 degree mirror in combination with the camera lens, or to modify the contact printing process by placing the back of the original sheet against the photoconductive layer so that a direct image will be produced on the layer instead of a mirrorreverse image.
Typography My process can also be used for producing typographical printing cuts or relief printing surfaces. This can be accomplished by producing a photoconductive insulating layer of anthracene or anthraquinone on a block of metal such as zinc or copper, exposing dusting with resin powder to form the image in mirrorreverse, heating to drive olf the antrracene (or anthraquinone) and to melt the resin onto the metal surface, cooling and then etching the plate in acid to etch away the metal not covered by the resin and thereby leave the image in raised relief. The cut thus produced can be used for printing in the usual way.
Hectcgraphic reproduction The present invention may also ce used for the preparation of masters for hectograph copying. In one method use is made of a so-called hectograph pan in which a gelatin compound is disposed in a layer. The dust image in such case is formed of a strong dye, such as crystal violet, or a dye compounded with gelatin and reduced to a fine dry powder.
The dust image, formed electrophotographically as heretofore described is transferred to the surface of the gelatin compound in the pan by pressing the dusted eelctrophotographic plate against the surface of the layer so that the dyestuff is absorbed in the surface of the gelatin compound. Then copies can be produced by pressing sheets of copy paper on the gelatin compound surface one at a time. In such a process the original photographic exposure should be such that a mirror-reverse is produced on the gelatin compound when the dust is transferred to it.
The same principle can also be extended to the process in which the gelatin composition is carried in a thin coating on a backing sheet, instead of being placed in a pan, the copies being run olf in a rotary cylinder copying machine.
In still another ,process use is made of a method known in the art as spirit duplication. In this case the dusting powder should be an alcohol soluble dye or dye composition.
Such dyes as the basic dyestuffs rhodamine, Victoria blue, Victoria green, crystal violet, nigrosine, methyl violet, induline may be employed either alone or compounded with an alcohol soluble resin.
In the case of a resin-compounded dye the dust image may be transferred to a paper sheet as heretofore described and melted onto the paper Aor adhered to it by wetting'slightly with alcohol.
Copies can then be run offv by attaching the master thus formed to the drum of a rotary duplicator and running through blank sheets moistened with alcohol or other spirit solvent, each of which picks up some of the dye.
If pure dye is used for the dusting powder it may be transferred to a specially prepared sheet having an adhesive on its surface (such as resin which can be melted to make the dye stick to the sheet).
According to a further modification the dyed resin can be melted directly onto the photoconductive insulating layer and the layer itself used as a master from which copies can be run off. If anthracene or anthroquinone or some other readily volatilized photoconductive layer is used it may be evaporated and .the image melted directly onto the metal backing.
H alf tones My process has been described particularly with relation to the reproduction of black-and-white copy such as printed matter, drawings and typewritten matter. I have successfully applied it, however, to the production of pictorial photographs. This is possible by virtue of the fact that where grays appear in the picture (i. e. areas not solid black nor pure white) the electrostatic charge is only discharged in part, leaving sucient charge to attract a small amount of powder but incapable of retaining enough powder to cover the surface with a dense layer. As a result the individual powder particles are spaced apart on the surface, the powder density depending on the intensity of the electric charge on the various parts of the surface. Since the particles are so extremely small as not to be individually visible the effect on the naked eye is of a picture of varying shades of gray, much the same as with an ordinary half -tone picture.
In fact, the picture thus produced is really a form of half tone and as such may be used for lithographic or hectographic reproduction of pictorial subjects and for the production of half-tone cuts. This may be better understood by reference to Figure 10 which is a highly magnified view of a dusted electrostatic image of a pictorial subject, the part reproduced being an enlargement of a human eye. It will be noted that in the darker parts of the image such as the eyelash and pupil the dust particles 3i are clustered close together, while in .the lighter parts the particles are more widely separated, and in the white parts no particles adhere at all.
If the particles are of fusible resin they can be melted onto the backing and each will serve as a tiny printing area in a lithographie or hectographic process. In the case of half-tone cuts the resin areas protect the backing metal while the surrounding uncovered areas are etched away.
By using powders in which particles of various diameters are mixed together in different proportions (rather than using grains all of one diameter, as illustrated) a variety of different effects can be achieved.
My process is also applicable to the making of half-tones by conventional methods such as by using a half-tone screen in the camera or by photographing a half-tone original.
Paper layers While I have described the photoconductive insulating layer as attached to a metal backing this is not always necessary. Where the material is of such nature as to form a sheet it may be used independently, it being only necessary to provide a conductive backing by contact during the exposure step to drain off the charge.
I have also found that certain of the materials can be impregnated into paper. It is preferred to use pure cellulose paper and to obtain more or less of a layer of the photoconductive insulating material on a surface of the paper as well as impregnated into the sheet. Anthracene is particularly useful for such a sheet although the other materials, including sulfur have also beenA salt, such as silver chloride, may be deposited in the paper and reduced to metallic silver by exposure to light, after which the sheet is thoroughly washed to eliminate any remaining chemicals, and then the photoconductive material applied. Certain conductive metallic compounds such as the suldes may also be used.
Another type of electrophotographic sheet is made by coating a sheet of paper with a layer of conductive material such as bronze or carbon powder held in a binder, the photoconductive insulating material being applied to .the conductive surface or impregnated into the sheet.
The conductive layer may be sprayed or painted onto the paper or rolled into the surface before applying the photoconductive material and in a some cases afterward.
Color photography It has already been mentioned that colored powders may be used in developing the image. It is thereby possible to produce a copy in any color, either the same as or different from that of the original.
The process can also be used for multi-color vphotography by exposing a plate first to the original through light filters which enable one color to be recorded, and then developing with colored powder to produce a copy of that color, then repeating for each other color and superimposing the dust images on the same copy sheet.
Conclusion An outstanding advantage of the process described herein is its simplicity and rapidity. It
is a matter of only a few seconds to make a complete permanent copy of any original. No complex chemical development process is required.
This gives the process a further advantage in that itmay readily be performed by mechanical means, it being only necessary to provide an apparatus for performing the necessary operations in sequence.
Another advantage resides in the fact that the sensitized plates may be used over and over again it merely being necessary to brush off the surface and recharge it before each exposure. Since the insulating photoconductive layer 2l is normally in contact with the air, which may often be quite humid, the material forming the layer should preferably be of a type which is not highly reactive and which is non-hygroscopic, since moisture in the layer will destroy its insulating properties. All of the materials described herein are of this type.
The plate need not be stored in the dark as is required with ordinary photographic plates, since the plate is prepared for exposure by charging the surface each time immediately before exposure.
The present process is suitable for copying letters, drawings, printed matter, books, typewritten matter, enlarging matter from films such as microfilm, pictorial photography, color photography, half-tone production and as a means for producing masters for lithographic, hectographic or typographical production of multiple copies.
In the specification and claims light is intended to refer not only to visible radiation but also other radiations which affect the photoconductive material, such as ultra-violet radiations, infra-red, etc.
The present application is a continuation in part of my prior-filed co-pending application S. N. 169,630, filed October 18, 1937.
While the present invention, as to its objects and advantages, has been described herein as carried out in specific embodiments thereof, itis not desired to be limited thereby but it is intended to cover the invention broadly within the spirit and scope of the appended claims.
What is claimed is:
1. The method of making a photographic reproduction which comprises applying a uniform layer of photoconductive insulating material to a plane conductive backing, developing a strong electrostatic charge on the surface of said layer by rubbing said surface, exposing the layer to a light image whereby to render the illuminated areas thereof sufficiently conductive to drain off a substantial proportion of said charge to said conductive backing, then bringing a ne dust into contact with the surface whereby to form an electro-static dust deposit on the areas of said surface remaining charged after the exposure, then blowing off excess dust not electrostatically held on said surface, whereby a dust image will be produced in which the dark areas of the original image will be reproduced as dust deposit areas.
2. The method of making a photographic reproduction which comprises applying a uniform layer of photoconductive insulating material to a plane conductive backing, developing a strong electrostatic charge on the surface of said layer by rubbing said surface, exposing the layer to a light image whereby to render the illuminated areas thereof sufficiently conductive to drain off a substantial proportion of said charge to said conductive backing, then bringing a fine dust into contact with the surface whereby to form an electrostatic dust deposit on the areas of said surface remaining charged after the exposure, then blowing off excess dust not electrostatically held on said surface, whereby a dust image will be produced in which the dark areas of the original image will be reproduced as dust deposit areas, then transferring the dust image to a sheet of paper by pressing said pap-er against said surface.
3. The method of making a direct-positive photographic reproduction which comprises rubbing the surface of a layer of photoconductive insulating material to produce an electrostatic charge on said surface, then exposing the layer to a light image while simultaneously engaging the side of said layer opposite said charged surface with a conductive backing whereby the illuminated portions of said layer will have their conductivity increased by the illumination and will allow at least part of said charge to drain off to said conductive backing in said illuminated areas, then bringing a dark-colored powder into contact with said surface whereby to form a dust deposit thereon, removing the dust not held onto said surface by electrostatic attraction by passing an air stream over the surface, whereby a dust image is produced on said surface, transferring said dust image to a sheet of paper by pressing said sheet against said surface carrying the dust image and afiixing said dust to said paper.
4. The method of producing an electrostatic latent image which comprises rubbing the surface of a layer of photoconductive insulating material supported on a conductive backing to charge the surface thereof and produce a strong electric potential gradient through the layer between the charged surface and the backing and projecting a light image onto said layer whereby said layer is rendered partially conductive in the areas thereof illuminated by said image, said light image comprising a pattern of light and shadow to be recorded, said illumination increasing the electrical conductivity of said illuminated areas and thereby permitting a migration of electric charges through said layer in the illuminated ar-eas due to said potential gradient, but not to any substantial extent in the unilluminated areas, whereby said electrostatic latent image will be produced at the surface of said layer due to the chance in charge brought about on the illuminated parts of said surface by said charge migration, said image being trapped at said surface when said illumination is discontinue-d due to the return of said layer to its normal dark insulating value.
5. The method of photography which comprises charging the surface of a layer of photoconductive insulating material with an electric charge, exposing the layer photographically to a light image for a period sufficient to substantially discharge the areas receiving the highest intensity of illumination while at the same time engaging the opposite surface of said layer with a conductive backing, and then dusting the charged surface with a ne electroscopic powder to develop the charge image, and subsequently fixing the powder in the configuration in which it is deposited.
6. `The method of photography which comprises charging the surface of a layer of photoconductive insulating material with an electric charge, exposing the charged layer photographically Vwhile maintaining a conductive backing in contact with the surface of said layer opposite to said charged surface, and then dusting the charged surface with an electrostatically attractable finely divided material to develop the charge image.
'7. The method of photography which comprises applying a strong electric field through a layer of photoconductive insulating material and simultaneously projecting a light image onto said layer, said light image comprising a pattern of light and shadow to be recorded, whereby electricity will ow through said layer in the illuminated parts thereof, thereby producing an electrostatic charge image at a surface thereof, shutting off the illumination and storing said electrostatic charge image on said surface by protecting said layer from illumination subsequent to exposure to the light image, and subsequently developing said image by dusting said stored charge image with an electroscopic powder.
8. The method of making an electrostatic latent image. which comprises charging a surface of a layer of photoconductive insulating material with an -electrostatic charge and then exposing said layer to a light image while simultaneously engaging the sid-e of said layer opposite to said charged surface with a conductive backing, said light image comprising a pattern of light and shadow to be recorded, whereby the illuminated portions of said layer will have their conductivity increased by the illumination and will conduct at least part of said charge away to said conductive backing in said illuminated areas, thereby leaving an electrostatic latent image on said surface corresponding to said light image, and then cutting off the illumination of said layer and storing said electrostatic image on the surface thereof.
9. The method of forming an electrostatic latent image on the surface of a layer of photoconductive insulating material afliXed to a conductive backing which comprises charging the surface of said layer with a distributed electrostatic charge and then exposing said layer to a light image, said light image comprising a pattern of light and shadow to be recorded, whereby the illuminated portions of said layer will have their conductivity increased by the illumination and will conduct at least a part of said charge away to said conductive backing in said illuminated areas, thereby leaving an electrostatic latent image on said surface corresponding to said light image, and then cutting ofi" the illumination of said layer and storing said electrostatic image on the surface thereof for an indefinite period.
i0. The method of printing a design on a surface which comprises producing an electrostatic charge pattern on the surface of a layer of insulating material, depositing a powder on said pattern whereby to produce a corresponding powder design, and then transferring the powder design to a second surface by pressing said surfaces together, at least one of the materials comprising said powder and said second surface being thermoadhesive in nature, and permanently aflixing said powder design to said second surface by heating said surface and design until said thermoadhesive material becomes adhesive.
ll. The method of making a photographic reproduction which comprises applying an electric field through a layer of photoconductive insulating material and projecting an image onto said layer whereby a flow of electricity will take place through said layer producing an electrostatic latent image at a surface thereof, then depositing dust particles on said surface where said particles will adhere in a distribution varying in density with the intensity of the charge at the various parts of the surface.
l2. A device for electrophotography comprising a pair of layers of conductive material disposed in spaced parallel relation, a thin layer of photoconductive insulating material attached to one of said conductive layers on its surface nearest the other conductive layer, said photcconductive layer being spaced from said other conductive layer whereby it is insulated therefrom; one of said conductive layers being permeable to light, means for projecting a light image onto said photoconductive layer by projecting light through said light-permeable layer, and means for applying a high-voltage potential difference between said pair of conductive layers, whereby an electrostatic latent image corresponding to said light image may be produced on the exposed surface of said photoconductive insulating layer by application of said potential diiference and projecting said light image thereon, said layers being exposed to air at atmospheric pressure and said photoconductive insulating material being nonhygroscopic.
13. A device for reproducing images comprising a layer of photoconductive material of the type having a high insulating value in the dark, a contiguous contacting layer of conductive material engaging one surface of said photoconductive insulating layer, means for applying an electric iield through saidi phbtoconductive insulating layer and means for projecting a predetermined light image comprising a pattern of light and shadow to be recorded onto said photoconductive insulating layer, said layer of photoconductive material being exposed to air at atmospheric pressure, said material being non-hygroscopic.
14. An electrophotographic camera comprising a layer of photoconductive insulating material affixed to a conductive backing, a transparent conductive layer spaced yand insulated from the front surface of said photoconductive insulating layer and a lens supported in front of said layers in a position to project a light image onto said photoconductive layer through said transparent conductive layer, and means to apply a high voltage potential difference between said transparent conductive layer and said conductive backing.
15. An electrophoto camera comprising a light tight box having a lens and shutter for admitting a light image, a layer of photoconductive insulating material and a backing supporting said layer in a position within said box to receive an image projected thereon by said lens, spaced parallel conductive electrodes in front of and behind said layer, a high voltage source and means for connecting the terminals thereof to said electrodes to apply a high potential difference between said electrodes, said electrode in front of said layer being light permeable whereby said image may be projected therethrough, and an electric flood lamp mounted within said box for flooding said layer with light at the will of the operator.
16,. The method of producing an electrostatic latent image at the surface of a layer of photoconductive insulating material having a conductive backing, which comprises charging the front surface of said layer with a distributed electrostatic charge and subsequently exposing said layer to a light image comprising a pattern of light and shadow to be recorded, whereby at least part of said charge will drain off through said layer to said conductive backing in the illuminated areas of said layer leaving an electrostatic charge image on said layer, and then cutting oif said illumination.
17. rIfhe method of recording a light image comprising a pattern of light and shadow to be recorded which method comprises producing and storing an electrostatic latent image corresponding to said light image by creating a strong electric eld through a layer of photoconductive insulating material and exposing said layer to said light image to be recorded, whereby electricity will flow through said layer in the illuminated areas thereof thereby changing the charge condition of the illuminated areas at a surface of said layer thus producing said electrostatic latent image thereat, then cutting off the illumination of the image field of said layer to restore the normal dark insulating value to all parts of said layer in the image field and thereby entrap said electrostatic latent image at said surface for an indefinite period.
18. The method of producing an electrostatic latent image upon a layer of photoconductive insulating material which comprises charging the outer surface of said layer with a first polarity charge, then exposing said layer to a light image while supporting a transparent electrode spaced from said outer surface, said electrode being charged with the said first polarity charge, and continuing said exposure long enough for the most highly illuminated areas of said layer surface to discharge and to recharge to opposite polarity under influence of said electrode, whereby an electrostatic latent image is produced having areas thereof charged with said rst polarity charge and other areas thereof charged with the opposite polarity charge.
19. The method of recording a light image comprising a pattern of light and 'shadow to be recorded which method comprises producing and storing an electrostatic latent image corresponding to said light image by creating a strong electric field through a layer of photoconductive insulating material and exposing said layer to said light image to be recorded, whereby electricity will flow through said layer in the illuminated areas thereof thereby changing the charge condition of the illuminated areas at a surface of said layer thus producing said electrostatic latent image thereat, then cutting off the illumination of the image field of said layer to restore the normal dark insulating value to all parts of said layer in the image eld and thereby entrap said electrostatic latent image at said surface for an indefinite period, and subsequently depositing a finely divided material on said electrostatic latent image to form a corresponding image out of said material.
20. The method of photography which comprises applying a strong electric field through a layer of photoconductive insulating material and simultaneously projecting a light image onto said layer, said light image comprising a pattern of light and shadow to be recorded, whereby electricity will flow through said layer in the illuminated part thereof, thereby producing an electrostatic charge image at a surface thereof, and then depositing a finely divided electrostatically attractable material on said image to make the image Visible.
21. The method of electrographic recording which comprises producing an electrostatic latent image at the surface of a layer of insulating material, developing the image by depositing an electrostatically attractable iinely divided material thereon, then transferring the material in the image configuration to a second surface by pressure contact and aflixing the transferred material to the second surface.
22. The method of printing a design on a surface which comprises producing an electrostatic charge pattern on the surface of a layer of insulating material, depositing a finely divided material on said pattern whereby to render said pattern visible, and then transferring said material to a second surface and permanently afxing said material to said second surface in the configuration of said pattern.
23. The method of applying a design to a surface which comprises producing an electrostatic charge pattern at the surface of a layer of insulating material, depositing a powder on said pattern whereby to produce a corresponding powder design by the electrostatic attraction of said pattern for said powder, and bringing a second surface having an adhesive material thereon into contact with the powder design whereby to transfer said powder design to said second surface.
24. The method of applying a design to a surface which comprises producing an electrostatic charge pattern at the surface of a layer of insulating material, depositing a powder on said pattern whereby to produce a corresponding powder design by the electrostatic attraction of said pattern for said powder, and bringing a second surface having an adhesive material thereon into contact with the powder design whereby to transfer said powder design to said second surface, and then permanently affixing the powder design to said second surface.
25. The method of producing a powder design on a sheet of insulating material which comprises rst producing an electrostatic charge pattern on a second layer of insulating material, then placing said sheet in contact with said second layer and then bringing a iinely divided electroscopic material adjacent the exposed surface thereof, whereby the electrostatic charge pattern acting through said insulating sheet causes adherence of said electrosoopic material to the eX- posed surface thereof in a design corresponding to said pattern.
26. The method of producing a half-tone picture having varied shadings of light and shadow which comprises producing a distribution of individual solid particles of fusible material on a surface in a particle density corresponding to the degree of shading desired on each part of the surface and then aixing said particles to said surface, by melting said particles thereon to produce a half-tone dot from each of said particles.
2'?. The method of producing a half-tone picture having varied shadings of light and shadow which comprises producing an electrostatic charge image, producing under the iniiuence thereof a distribution of individual solid particles of fusible material on a surface in a particle density corresponding to the charge on each part of said electrostatic image and then aixing said particles to said surface by melting said particles thereon to produce a half-tone dot from each of said particles.
CHESTER F. CARLSON.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2431923 *||Aug 23, 1943||Dec 2, 1947||Rca Corp||Photographic record and method of forming same|
|US2484782 *||Feb 27, 1948||Oct 11, 1949||Haloid Co||Method of removing electroscopic powder from an electrophotographic plate|
|US2549546 *||Oct 24, 1947||Apr 17, 1951||Albert G Thomas||Photographic electrical copying device|
|US2551582 *||Aug 27, 1943||May 8, 1951||Chester F Carlson||Method of printing and developing solvent images|
|US2573881 *||Nov 2, 1948||Nov 6, 1951||Battelle Development Corp||Method and apparatus for developing electrostatic images with electroscopic powder|
|US2576047 *||Oct 21, 1948||Nov 20, 1951||Battelle Development Corp||Method and apparatus for printing electrically|
|US2586484 *||Apr 29, 1950||Feb 19, 1952||Haloid Co||Fusing device|
|US2598732 *||Mar 9, 1949||Jun 3, 1952||Haloid Co||Electrophotography|
|US2599542 *||Mar 23, 1948||Jun 10, 1952||Chester F Carlson||Electrophotographic plate|
|US2600580 *||Jun 3, 1949||Jun 17, 1952||Haloid Co||Electrophotographic apparatus|
|US2618551 *||Oct 20, 1948||Nov 18, 1952||Haloid Co||Developer for electrostatic images|
|US2618552 *||Jul 18, 1947||Nov 18, 1952||Battelle Development Corp||Development of electrophotographic images|
|US2624652 *||Oct 11, 1944||Jan 6, 1953||Chester F Carlson||Graphic recording|
|US2637651 *||Oct 2, 1948||May 5, 1953||Battelle Development Corp||Method of producing images on rigid surfaces|
|US2638416 *||May 1, 1948||May 12, 1953||Battelle Development Corp||Developer composition for developing an electrostatic latent image|
|US2647464 *||Oct 26, 1949||Aug 4, 1953||Battelle Development Corp||Electrography|
|US2659670 *||Jun 6, 1950||Nov 17, 1953||Haloid Co||Method of developing electrostatic images|
|US2663636 *||May 25, 1949||Dec 22, 1953||Haloid Co||Electrophotographic plate and method of producing same|
|US2666144 *||Feb 2, 1950||Jan 12, 1954||Battelle Development Corp||Electroradiography|
|US2676100 *||Feb 2, 1952||Apr 20, 1954||Huebner Company||Method and apparatus for reproducing images|
|US2681473 *||Dec 30, 1948||Jun 22, 1954||Chester F Carlson||Manufacture of plaques and the like|
|US2682478 *||Sep 11, 1950||Jun 29, 1954||Technicolor Motion Picture||Method of forming television screens|
|US2690394 *||Jun 6, 1950||Sep 28, 1954||Chester F Carlson||Electrophotography|
|US2693416 *||May 19, 1950||Nov 2, 1954||Western Electric Co||Method of electrostatic electrophotography|
|US2712607 *||Jul 1, 1952||Jul 5, 1955||Orlando Carl||Device for intensifying photoelectrostatic image|
|US2716048 *||Aug 14, 1952||Aug 23, 1955||Charles J Young||Electrostatic facsimile receiver|
|US2727826 *||Sep 30, 1950||Dec 20, 1955||Rca Corp||Image transfer material and method of making it|
|US2732775 *||Feb 11, 1953||Jan 31, 1956|| ||Continuous direct electrophotographic recorder|
|US2745327 *||May 12, 1952||May 15, 1956||Haloid Co||Electrophotographic process|
|US2750922 *||Dec 13, 1951||Jun 19, 1956||Haloid Co||Apparatus for developing electrophotographic plates|
|US2752833 *||Nov 2, 1950||Jul 3, 1956||Carlyle W Jacob||Apparatus for reproduction of pictures|
|US2758524 *||Dec 30, 1953||Aug 14, 1956||Rca Corp||Electrostatic photographic printing|
|US2758525 *||Dec 30, 1953||Aug 14, 1956||Rca Corp||Electrostatic photographic printing|
|US2764500 *||Oct 4, 1951||Sep 25, 1956||Huebner Company||Method and apparatus for reproducing images|
|US2774921 *||Apr 23, 1953||Dec 18, 1956||Haloid Co||Apparatus for electrostatically charging insulating image surfaces for electrophotography|
|US2776907 *||Jul 18, 1952||Jan 8, 1957||Battelle Development Corp||Method of fixing electrostatic powder image|
|US2788288 *||Jul 29, 1953||Apr 9, 1957||Haloid Co||Process and composition for developing an electrostatic image|
|US2803177 *||Dec 31, 1953||Aug 20, 1957||Ibm||Apparatus and method for xerographic printing|
|US2803541 *||May 29, 1953||Aug 20, 1957||Haloid Co||Xerographic plate|
|US2804396 *||Aug 19, 1952||Aug 27, 1957||Battelle Development Corp||Process of preparing an chi-ray sensitive member|
|US2808328 *||Jul 15, 1950||Oct 1, 1957||Carlyle W Jacob||Method and apparatus for xerographic reproduction|
|US2816493 *||Mar 19, 1953||Dec 17, 1957||Haloid Co||Electrophotographic microfilm enlarger|
|US2817277 *||Jan 7, 1955||Dec 24, 1957||Haloid Co||Electrophotographic camera|
|US2817598 *||Feb 1, 1955||Dec 24, 1957||Haloid Co||Continuous tone reversal development process|
|US2825814 *||Jun 4, 1954||Mar 4, 1958||Haloid Co||Xerographic image formation|
|US2826168 *||Apr 16, 1956||Mar 11, 1958||Grant Photo Products Inc||Means for making electrostatic prints|
|US2829050 *||Feb 23, 1952||Apr 1, 1958||Huebner Company||Method and apparatus for reproducing images|
|US2833648 *||Jul 16, 1953||May 6, 1958||Haloid Co||Transfer of electrostatic charge pattern|
|US2833930 *||Jul 16, 1953||May 6, 1958||Haloid Co||Electrostatic charging method and apparatus|
|US2838997 *||Oct 30, 1953||Jun 17, 1958||Rca Corp||Electrostatic image copying method|
|US2839400 *||Oct 30, 1953||Jun 17, 1958||Rca Corp||Electrostatic printing|
|US2843499 *||Sep 25, 1956||Jul 15, 1958||Haloid Xerox Inc||Pressure transfer of xerographic images|
|US2845348 *||Jan 4, 1952||Jul 29, 1958||Kallman Hartmut||Electro-photographic means and method|
|US2846333 *||Nov 1, 1955||Aug 5, 1958||Haloid Xerox Inc||Method of developing electrostatic images|
|US2853383 *||Oct 2, 1953||Sep 23, 1958||Keck Paul H||Method and apparatus for amplifying photoelectric currents|
|US2855297 *||May 16, 1955||Oct 7, 1958||Owens Illinois Glass Co||Electrophotographic method of applying art work to rubber for engraving|
|US2855324 *||Apr 7, 1955||Oct 7, 1958|| ||van dorn|
|US2857271 *||Sep 28, 1954||Oct 21, 1958||Rca Corp||Electrostatic printing process for producing photographic transparencies|
|US2857272 *||Sep 28, 1954||Oct 21, 1958||Rca Corp||Electrostatic printing|
|US2860048 *||Jun 13, 1955||Nov 11, 1958||Haloid Xerox Inc||Xerographic plate|
|US2861543 *||Jun 14, 1954||Nov 25, 1958||Haloid Xerox Inc||Apparatus for development of electrostatic image|
|US2862815 *||Oct 1, 1953||Dec 2, 1958||Rca Corp||Electrophotographic member|
|US2862816 *||Mar 26, 1954||Dec 2, 1958||Rca Corp||Method of and means for reducing triboelectric forces in electrophotography|
|US2863768 *||Jul 5, 1955||Dec 9, 1958||Haloid Xerox Inc||Xerographic plate|
|US2868642 *||Jan 3, 1955||Jan 13, 1959||Haloid Xerox Inc||Electrophotographic method|
|US2873721 *||Nov 3, 1954||Feb 17, 1959||Haloid Xerox Inc||Micromanifold for powder cloud development|
|US2874064 *||May 16, 1955||Feb 17, 1959||Haloid Xerox Inc||Xerographic cleaner|
|US2876737 *||Oct 12, 1953||Mar 10, 1959||Battelle Development Corp||Apparatus for developing electrostatic images on sheet material|
|US2881073 *||Dec 29, 1955||Apr 7, 1959||Ibm||Method of forming permanent data on magnetic recording media|
|US2885556 *||Aug 1, 1955||May 5, 1959||Haloid Xerox Inc||Simultaneous charging device and method|
|US2885955 *||May 11, 1955||May 12, 1959||Haloid Xerox Inc||Xerographic machine|
|US2886434 *||Jun 6, 1955||May 12, 1959||Horizons Inc||Protected photoconductive element and method of making same|
|US2886464 *||Aug 9, 1955||May 12, 1959||Haloid Xerox Inc||Contact transfer for xerography|
|US2890968 *||Jun 2, 1955||Jun 16, 1959||Rca Corp||Electrostatic printing process and developer composition therefor|
|US2892794 *||Jan 3, 1955||Jun 30, 1959||Haloid Xerox Inc||Electrostatic developer and toner|
|US2894840 *||Jun 14, 1955||Jul 14, 1959||Haloid Xerox Inc||Method for fixing xerographic images|
|US2895847 *||Dec 21, 1953||Jul 21, 1959||Battelle Development Corp||Electric image development|
|US2898468 *||Jun 29, 1956||Aug 4, 1959||Gen Dynamics Corp||Recording apparatus|
|US2899331 *||Jan 25, 1955||Aug 11, 1959||Haloid Xerox Inc||Process of developing electrostatic|
|US2899335 *||Oct 31, 1956||Aug 11, 1959|| ||Process for developing electrostatic|
|US2900515 *||Mar 16, 1956||Aug 18, 1959||Edward L Criscuolo||Radiography by gas ionization|
|US2901348 *||Mar 17, 1953||Aug 25, 1959||Haloid Xerox Inc||Radiation sensitive photoconductive member|
|US2901374 *||May 4, 1955||Aug 25, 1959||Battelle Development Corp||Development of electrostatic image and apparatus therefor|
|US2904000 *||May 15, 1957||Sep 15, 1959||Century Geophysical Corp||Magnetic-brush developer|
|US2904431 *||Aug 26, 1954||Sep 15, 1959||Rca Corp||Electrographotographic charging means|
|US2907674 *||Dec 19, 1956||Oct 6, 1959||Commw Of Australia||Process for developing electrostatic image with liquid developer|
|US2909118 *||Jan 5, 1956||Oct 20, 1959||Warren S D Co||Magnetically imageable planographic plate|
|US2910351 *||Aug 3, 1955||Oct 27, 1959||Gen Electric||Method of making printed circuit|
|US2914403 *||May 17, 1955||Nov 24, 1959||Rca Corp||Electrostatic printing|
|US2914996 *||Jun 3, 1953||Dec 1, 1959||Sprague Electric Co||Electrostatic unit for producing printed circuits|
|US2917385 *||Aug 26, 1955||Dec 15, 1959||Haloid Xerox Inc||Reflex xerography|
|US2919179 *||May 21, 1956||Dec 29, 1959||Haloid Xerox Inc||Resist forming method|
|US2919191 *||Dec 27, 1954||Dec 29, 1959||Haloid Xerox Inc||Xerographic transfer method|
|US2919247 *||Dec 23, 1954||Dec 29, 1959||Haloid Xerox Inc||Tripartite developer for electrostatic images|
|US2922716 *||Feb 11, 1954||Jan 26, 1960||Frederick Nathan||Process of and apparatus for preparing photo-engraved printing plates|
|US2934649 *||Jan 9, 1957||Apr 26, 1960||Haloid Xerox Inc||Induction charging|
|US2937943 *||Jan 9, 1957||May 24, 1960||Haloid Xerox Inc||Transfer of electrostatic charge pattern|
|US2939787 *||Mar 1, 1957||Jun 7, 1960||Rca Corp||Exposure of photochemical compositions|
|US2940847 *||Jul 3, 1957||Jun 14, 1960|| ||None i red|
|US2943950 *||May 7, 1953||Jul 5, 1960||Haloid Xerox Inc||Electrostatic developing apparatus and method|
|US2947625 *||Dec 21, 1955||Aug 2, 1960||Ibm||Method of manufacturing printed circuits|
|US2949848 *||Jul 27, 1955||Aug 23, 1960||Haloid Xerox Inc||Stencil making|
|US2954291 *||Jan 4, 1957||Sep 27, 1960||Haloid Xerox Inc||Method for preparing a spirit duplicating master|
|US2955035 *||Jan 3, 1956||Oct 4, 1960||Haloid Xerox Inc||Raised xerographic images|
|US2955938 *||Aug 1, 1955||Oct 11, 1960||Haloid Xerox Inc||Xerography|
|US2956487 *||Mar 23, 1955||Oct 18, 1960||Rca Corp||Electrostatic printing|
|US2956875 *||Sep 26, 1958||Oct 18, 1960||Rca Corp||Electrophotographic process for making stencil screens|
|US2957765 *||Jun 13, 1957||Oct 25, 1960||Gen Aniline & Film Corp||Method of and composition for preparing lithographic printing plates|
|US2962374 *||May 1, 1956||Nov 29, 1960||Haloid Xerox Inc||Color xerography|
|US2962375 *||May 2, 1956||Nov 29, 1960||Haloid Xerox Inc||Color xerography|
|US2963365 *||Feb 16, 1956||Dec 6, 1960||Rca Corp||Electrostatic printing|
|US2965481 *||Aug 1, 1955||Dec 20, 1960||Haloid Xerox Inc||Electrostatic charging and image formation|
|US2965483 *||Sep 23, 1958||Dec 20, 1960||Haloid Xerox Inc||Xerographic contrast|
|US2966429 *||Aug 31, 1956||Dec 27, 1960||Gen Electric||Method of and apparatus for making printed circuits|
|US2970906 *||Aug 5, 1955||Feb 7, 1961||Haloid Xerox Inc||Xerographic plate and a process of copy-making|
|US2975052 *||Mar 19, 1956||Mar 14, 1961||Gen Dynamics Corp||Electrostatic printing|
|US2979402 *||Jul 31, 1956||Apr 11, 1961||Rca Corp||Electrostatic printing|
|US2982647 *||Jun 14, 1956||May 2, 1961||Haloid Xerox Inc||Electrostatic image reproduction|
|US2984163 *||Jun 30, 1953||May 16, 1961|| ||giaimo|
|US2986466 *||Dec 6, 1955||May 30, 1961||Kaprelian Edward K||Color electrophotography|
|US2990280 *||Oct 24, 1958||Jun 27, 1961||Rca Corp||Electrostatic printing|
|US2990473 *||May 4, 1955||Jun 27, 1961||Research Corp||Method for recording, detecting and measuring radiation and for recording and recalling data|
|US2992128 *||Apr 30, 1956||Jul 11, 1961||Little Inc A||Record members to provide a visible trace of movement of a mechanical stylus|
|US2995085 *||Feb 23, 1954||Aug 8, 1961||Haloid Xerox Inc||Transfer and fixing method|
|US2996400 *||Aug 30, 1956||Aug 15, 1961||Eastman Kodak Co||Positive and negative electroprinting|
|US3000735 *||Jun 11, 1956||Sep 19, 1961||Franklin Keller Daniel||Method and apparatus for the reproduction of images|
|US3001872 *||Mar 18, 1957||Sep 26, 1961||Xerox Corp||Preparing planographic plates and solution therefor|
|US3005707 *||Apr 16, 1956||Oct 24, 1961||Leonard E Ravich||Devices exhibiting persistent internal polarization and methods of utilizing the same|
|US3008826 *||Mar 6, 1958||Nov 14, 1961||Xerox Corp||Xerographic development|
|US3010842 *||Aug 29, 1955||Nov 28, 1961||Xerox Corp||Development of electrostatic images|
|US3010883 *||Mar 30, 1956||Nov 28, 1961||Minnesota Mining & Mfg||Electrolytic electrophotography|
|US3010884 *||Oct 28, 1957||Nov 28, 1961||Minnesota Mining & Mfg||Electrophotosensitive copy-sheet|
|US3011436 *||Sep 30, 1953||Dec 5, 1961||Gen Electric||Methods of making printing plates|
|US3011473 *||May 1, 1958||Dec 5, 1961||Xerox Corp||Xerographic apparatus|
|US3013878 *||Dec 29, 1955||Dec 19, 1961||Xerox Corp||Method and apparatus for transferring and fixing xerographic images|
|US3013890 *||Jul 8, 1958||Dec 19, 1961||Xerox Corp||Process of developing electrostatic images and composition therefor|
|US3015304 *||Oct 2, 1957||Jan 2, 1962||Xerox Corp||Electrostatic image reproduction|
|US3025160 *||Jun 3, 1958||Mar 13, 1962||Agfa Ag||Electrostatic printing|
|US3028799 *||Mar 8, 1957||Apr 10, 1962||Franklin Keller Daniel||Apparatus for electrophotographic printing|
|US3031572 *||Nov 5, 1959||Apr 24, 1962||Ryan Charles E||Infrared xerography|
|US3032432 *||Jul 31, 1958||May 1, 1962||Commw Of Australia||Controlled tone development for electrophotography|
|US3037861 *||Sep 8, 1958||Jun 5, 1962||Kalle Ag||Electrophotographic reproduction material|
|US3038442 *||Dec 29, 1958||Jun 12, 1962||Burroughs Corp||Electrostatic developing apparatus|
|US3043684 *||Jan 26, 1955||Jul 10, 1962||Gen Dynamics Corp||Electrostatic printing|
|US3043685 *||Jul 18, 1957||Jul 10, 1962||Xerox Corp||Xerographic and magnetic image recording and reproducing|
|US3043686 *||Jul 8, 1958||Jul 10, 1962||Xerox Corp||Xerographic color masking|
|US3045644 *||Jun 6, 1957||Jul 24, 1962||Xerox Corp||Two-color electrostatic printing apparatus|
|US3051568 *||Dec 6, 1955||Aug 28, 1962||Edward K Kaprelian||Offset electrophotography|
|US3052539 *||Oct 1, 1953||Sep 4, 1962||Rca Corp||Electrostatic printing|
|US3052540 *||Apr 20, 1959||Sep 4, 1962||Rca Corp||Dye sensitization of electrophotographic materials|
|US3052564 *||Feb 26, 1957||Sep 4, 1962||Ibm||Printing with magnetic ink|
|US3053688 *||Apr 13, 1959||Sep 11, 1962||Rca Corp||Electrostatic printing|
|US3054897 *||Aug 16, 1957||Sep 18, 1962||Mason & Sons Ltd E N||Process of and apparatus for printing or copying by electrostatic photography|
|US3056136 *||Oct 31, 1957||Sep 25, 1962||Jack E Macgriff||Image control device and method of printing|
|US3057719 *||Jul 9, 1958||Oct 9, 1962||Xerox Corp||Process for forming electrostatic images|
|US3057720 *||May 4, 1959||Oct 9, 1962||Xerox Corp||Xerographic color reproduction|
|US3057997 *||May 21, 1956||Oct 9, 1962||Kaprelian Edward K||Exposure charged electrophotography|
|US3060019 *||Jul 22, 1958||Oct 23, 1962||Rca Corp||Color electrophotography|
|US3060020 *||Nov 2, 1959||Oct 23, 1962||Rca Corp||Method of electrophotographically producing a multicolor image|
|US3060021 *||Nov 2, 1959||Oct 23, 1962||Rca Corp||Method for electrophotographically producing a multicolor picture|
|US3060051 *||Nov 25, 1958||Oct 23, 1962||Rca Corp||Method of fusing powder images|
|US3066023 *||Nov 20, 1959||Nov 27, 1962||Azoplate Corp||Member for electrophotographic reproduction and process therefor|
|US3072479 *||May 29, 1957||Jan 8, 1963||Azoplate Corp||Electrophotographic plates comprising solid solutions of oxazolones|
|US3076722 *||Apr 29, 1959||Feb 5, 1963||Rca Corp||Electrostatic printing|
|US3079272 *||Apr 24, 1959||Feb 26, 1963||Rca Corp||Method of developing an electrostatic image|
|US3081165 *||Sep 9, 1957||Mar 12, 1963||Xerox Corp||Xerographic chemography|
|US3083622 *||Jun 12, 1959||Apr 2, 1963||Robertson Photo Mechanix Inc||Xerographic apparatus|
|US3083684 *||Sep 29, 1955||Apr 2, 1963||Xerox Corp||Apparatus for pattern reproduction|
|US3084061 *||Sep 23, 1953||Apr 2, 1963||Xerox Corp||Method for formation of electro-static image|
|US3089953 *||Apr 13, 1960||May 14, 1963||Kalle Ag||Reproduction process|
|US3097095 *||Nov 20, 1957||Jul 9, 1963||Azoplate Corp||Material for electrophotographic reproduction|
|US3102026 *||Dec 22, 1958||Aug 27, 1963||Archibald Metcalfe Kenneth||Electrophotographic reflex and contact printing|
|US3102045 *||Jun 25, 1958||Aug 27, 1963||Metcalfe Kenneth Archibald||Production of patterns on cloth or similar substances|
|US3106479 *||Dec 3, 1952||Oct 8, 1963||Rca Corp||Electrostatic printing method and apparatus|
|US3108894 *||May 18, 1959||Oct 29, 1963||Burroughs Corp||Electrostatic charge production|
|US3109367 *||Jan 3, 1955||Nov 5, 1963||Xerox Corp||Method for pattern reproduction|
|US3110621 *||Feb 1, 1960||Nov 12, 1963||Warren S D Co||Electrostatic recording paper|
|US3112197 *||Jun 3, 1957||Nov 26, 1963||Azoplate Corp||Electrophotographic member|
|US3116147 *||Aug 18, 1958||Dec 31, 1963||Plastic Coarting Corp||Coated paper sheet adapted for electrophotographic reproduction|
|US3117884 *||Mar 23, 1955||Jan 14, 1964||Rca Corp||Electrostatic printing process and apparatus|
|US3121006 *||Jun 26, 1957||Feb 11, 1964||Xerox Corp||Photo-active member for xerography|
|US3121007 *||Feb 12, 1958||Feb 11, 1964||Xerox Corp||Photo-active member for xerography|
|US3124456 *||Dec 2, 1959||Mar 10, 1964|| ||figure|
|US3130046 *||Dec 4, 1959||Apr 21, 1964||Azoplate Corp||Electrophotographic reproduction material|
|US3132037 *||Apr 4, 1960||May 5, 1964||Xerox Corp||Xerographic transfer method|
|US3133484 *||Sep 29, 1961||May 19, 1964||Rca Corp||Electrostatic printing apparatus|
|US3138458 *||Sep 30, 1955||Jun 23, 1964||Minnesota Mining & Mfg||Electrophotography|
|US3140175 *||Mar 14, 1960||Jul 7, 1964||Edward K Kaprelian||Color electrophotography|
|US3143066 *||Jan 5, 1954||Aug 4, 1964||Xerox Corp||Production of duplicating masters|
|US3143508 *||Mar 14, 1960||Aug 4, 1964||Edward K Kaprelian||Developer for electrophotography|
|US3146100 *||Jan 26, 1960||Aug 25, 1964||Bohn Business Machines Inc||Electronic photocopying apparatus and method|
|US3158475 *||Feb 4, 1960||Nov 24, 1964||Gevaert Photo Prod Nv||Electrophotographic material|
|US3159483 *||Jun 17, 1960||Dec 1, 1964||Azoplate Corp||Process for the preparation of electrophotographic reversed images|
|US3161505 *||Dec 26, 1961||Dec 15, 1964||Azoplate Corp||Material for electrophotographic purposes|
|US3162532 *||Jun 13, 1960||Dec 22, 1964||Azoplate Corp||Photoconductive layers for electrophotographic purposes|
|US3166418 *||May 7, 1959||Jan 19, 1965||Xerox Corp||Image development|
|US3166432 *||May 7, 1959||Jan 19, 1965||Xerox Corp||Image development|
|US3172826 *||Apr 18, 1960||Mar 9, 1965|| ||Photoconductography employing organic onium cation|
|US3172827 *||Apr 18, 1960||Mar 9, 1965||Minnesota Mining and Mannfaclering Company||Permanent reproductions|
|US3174854 *||Apr 6, 1960||Mar 23, 1965||Azoplate Corp||Electrophotographic reproduction material|
|US3178281 *||May 24, 1961||Apr 13, 1965||Eastman Kodak Co||Electrostatic color printing|
|US3180729 *||Dec 18, 1957||Apr 27, 1965||Azoplate Corp||Material for electrophotographic reproduction|
|US3180730 *||Apr 7, 1960||Apr 27, 1965||Azoplate Corp||Material for electrophotographic purposes|
|US3182573 *||Aug 11, 1961||May 11, 1965||Xerox Corp||Masked plate xerography|
|US3190199 *||Jan 2, 1963||Jun 22, 1965||Xerox Corp||Xerographic copying apparatus|
|US3196008 *||May 8, 1962||Jul 20, 1965||Xerox Corp||Electrophotographic process for formation of frost-like deformation images in mechanically deformable photoconductive layers|
|US3196029 *||Oct 19, 1961||Jul 20, 1965||Kalle Aktiengeselslchaft||Heat-copying process|
|US3198632 *||Jun 5, 1959||Aug 3, 1965||Minnesota Mining & Mfg||Electrophotography|
|US3199086 *||Nov 25, 1960||Aug 3, 1965||Rahn Corp||Devices exhibiting internal polarization and apparatus for and methods of utilizing the same|
|US3205354 *||Jan 5, 1962||Sep 7, 1965||Azoplate Corp||Electrothermographic reproduction process|
|US3206306 *||Apr 7, 1960||Sep 14, 1965||Azoplate Corp||Material for electrophotographic purposes|
|US3212888 *||Jun 12, 1961||Oct 19, 1965||Xerox Corp||Method for developing latent electrostatic charge halftone images|
|US3212889 *||Jun 12, 1961||Oct 19, 1965||Xerox Corp||Xerographic contrast control|
|US3226227 *||Sep 2, 1960||Dec 28, 1965||Rca Corp||Method of producing a solvent-resistant pattern using developed electrostatic image formation techniques|
|US3234017 *||Nov 1, 1960||Feb 8, 1966||Agfa Ag||Process for the production of developed electrophotographic images including application of a breakdown potential to discrete small areas of a photoconductor|
|US3234018 *||Mar 8, 1961||Feb 8, 1966||Lumoprint Zindler Kg||Method for developing copies using electrophotographic layers|
|US3234019 *||Apr 10, 1961||Feb 8, 1966||Xerox Corp||Method for formation of an electrostatic image resistant to deterioration on storage|
|US3234904 *||Jun 15, 1962||Feb 15, 1966||Xerox Corp||Device for tesiprinting|
|US3236640 *||Dec 21, 1960||Feb 22, 1966||Azoplate Corp||Process for the preparation of printing plates using particularly a photoconductivemultilayer structure|
|US3241957 *||Jun 8, 1961||Mar 22, 1966||Harris Intertype Corp||Method of developing electrostatic images and liquid developer|
|US3244516 *||Apr 7, 1960||Apr 5, 1966||Azoplate Corp||Electrophotographic mateiral and process|
|US3245783 *||Apr 8, 1960||Apr 12, 1966||Azoplate Corp||Material for electrophotographic purposes|
|US3245823 *||Aug 1, 1962||Apr 12, 1966||Xerox Corp||Electrostatic image development apparatus|
|US3246983 *||Apr 6, 1960||Apr 19, 1966||Azoplate Corp||Electrophotographic reproduction process|
|US3251706 *||Jan 4, 1954||May 17, 1966||Xerox Corp||Xerographic development method and apparatus|
|US3253913 *||Oct 13, 1960||May 31, 1966||Eastman Kodak Co||Process for color electrophotography|
|US3256791 *||Apr 29, 1963||Jun 21, 1966||Azoplate Corp||Electrophotographic process and apparatus for the automatic and continuous reproduction of originals|
|US3262806 *||Dec 13, 1962||Jul 26, 1966||Azoplate Corp||Three component magnetic developer for electrophotographic purposes and method for using it|
|US3275478 *||Mar 18, 1965||Sep 27, 1966||Fmc Corp||Method of making a battery separator containing colloidal metal|
|US3278323 *||Dec 26, 1963||Oct 11, 1966||Dick Co Ab||Method of producing imaged spirit master directly from original|
|US3279366 *||May 12, 1965||Oct 18, 1966||Dick Co Ab||Aluminum photolithographic plate and method of imaging same|
|US3279918 *||Feb 4, 1960||Oct 18, 1966||Gevaert Photo Prod Nv||Electrophotographic material|
|US3280741 *||Dec 31, 1958||Oct 25, 1966||Burroughs Corp||Electrostatic recording|
|US3294531 *||Jul 5, 1960||Dec 27, 1966||Azoplate Corp||Photoconductive layers for electrophotographic purposes|
|US3301676 *||Oct 9, 1964||Jan 31, 1967||Azoplate Corp||Process and material for the production of electrophotographic images|
|US3305359 *||Oct 4, 1962||Feb 21, 1967||Photoelectric Ltd||Manufacture of printing plates|
|US3311490 *||Sep 23, 1958||Mar 28, 1967||Harris Intertype Corp||Developing electrostatic charge image with a liquid developer of two immiscible phases|
|US3321307 *||Jul 15, 1963||May 23, 1967||Eastman Kodak Co||Exposure control in xerographic printing|
|US3326709 *||Oct 18, 1963||Jun 20, 1967||Eastman Kodak Co||Electrostatic printing|
|US3329500 *||Jun 7, 1965||Jul 4, 1967||Xerox Corp||Electrostatic frosting|
|US3357830 *||Aug 3, 1961||Dec 12, 1967||Xerox Corp||Dyed image xerography|
|US3363558 *||Jul 1, 1966||Jan 16, 1968||Everett A. Johnson||Tabulatable recording and duplicating master|
|US3369917 *||Sep 10, 1963||Feb 20, 1968||Daniel B. Granzow||Magnetic brush development of electrostatic images utilizing a high voltage corona|
|US3379553 *||Mar 20, 1964||Apr 23, 1968||Ibm||Continuous tone development method for xerographic printing|
|US3386379 *||Apr 26, 1963||Jun 4, 1968||Xerox Corp||Duplicating with color producing reagents|
|US3391082 *||Apr 6, 1965||Jul 2, 1968||Koppers Co Inc||Method of making xergographic toner compositions by emulsion polymerization|
|US3399060 *||Apr 16, 1963||Aug 27, 1968||Little Inc A||Electrophotographic product and method for achieving electrophotographic copying|
|US3399140 *||Sep 7, 1965||Aug 27, 1968||American Photocopy Equip Co||Liquid developer for electrostatic printing|
|US3406063 *||Mar 8, 1965||Oct 15, 1968||Australia Res Lab||Xerographic material containing an inorganic photoconductor and nonpolymeric crystalline organic substances and methods of using of such material|
|US3411903 *||Nov 23, 1964||Nov 19, 1968||Xerox Corp||Xerographic method and plate comprising photoconductive insulating fibers|
|US3414409 *||Apr 30, 1965||Dec 3, 1968||Xerox Corp||Particle transfer|
|US3415186 *||Feb 10, 1966||Dec 10, 1968||Xerox Corp||Duplicating system|
|US3419411 *||Apr 20, 1967||Dec 31, 1968||Australia Res Lab||Method for the transfer of developed electrostatic images using a lattice forming substance|
|US3441437 *||Jan 25, 1963||Apr 29, 1969||Burroughs Corp||Recording medium and process of developing latent electrostatic image on a recording medium|
|US3450564 *||Apr 1, 1968||Jun 17, 1969||Gen Electrodynamics Corp||Making photoconductive target of selenium and sulphur|
|US3455240 *||Sep 13, 1965||Jul 15, 1969||Xerox Corp||Imaging system|
|US3468254 *||May 21, 1965||Sep 23, 1969||Gerhard Ritzerfeld||Electrostatically chargeable printing form|
|US3473923 *||Apr 13, 1966||Oct 21, 1969||Fuji Photo Film Co Ltd||Reproduction process including transfer and redevelopment of electrostatically formed images|
|US3479268 *||Aug 1, 1966||Nov 18, 1969||Gen Electric||Method of applying a binder to electro phoretically deposited porous matrix|
|US3482970 *||Jan 21, 1966||Dec 9, 1969||Xerox Corp||Electrophotographic plate and process using naphthylazo compounds as the primary photoconductor|
|US3486889 *||Feb 7, 1966||Dec 30, 1969||Harris Intertype Corp||Cellulosic photoconductive imaging member containing carboxyl reactive groups|
|US3490903 *||Jul 20, 1966||Jan 20, 1970||Xerox Corp||Alloys of antimony and selenium used in photoconductive elements|
|US3493412 *||Jan 17, 1966||Feb 3, 1970||Xerox Corp||Transferring xerographic toner images to a solid crystalline plasticizer coated receiving surface|
|US3502582 *||Jun 19, 1967||Mar 24, 1970||Xerox Corp||Imaging systems|
|US3510338 *||Aug 6, 1965||May 5, 1970||Inmont Corp||Method of electrostatic printing|
|US3518081 *||Feb 17, 1964||Jun 30, 1970||Xerox Corp||Image formation and development|
|US3519420 *||Jun 28, 1966||Jul 7, 1970||Xerox Corp||Method of charging a zinc oxide photoconductive layer with a positive charge|
|US3523813 *||Aug 17, 1966||Aug 11, 1970||Koller Willy||Application of a printed impression of metal powder onto articles|
|US3533788 *||Aug 25, 1967||Oct 13, 1970||Minnesota Mining & Mfg||Image recording sheet|
|US3547631 *||Oct 26, 1967||Dec 15, 1970||Hughes Aircraft Co||Pacification of image recording media comprising applying a thin polymer film over the image surface|
|US3561358 *||Oct 10, 1966||Feb 9, 1971||Xerox Corp||Gravure imaging system|
|US3569803 *||Aug 14, 1968||Mar 9, 1971||Fuji Photo Film Co Ltd||Electrophotographic process utilizing friction charging|
|US3592541 *||Sep 30, 1968||Jul 13, 1971||Gourdine Systems Inc||Copying system using electrogasdynamics|
|US3607259 *||Dec 27, 1967||Sep 21, 1971||Australia Res Lab||Package of charged photoconductive recording elements for electrophotography|
|US3640749 *||Mar 11, 1969||Feb 8, 1972||Philips Corp||Method of fixing images consisting of dry powders on paper|
|US3650754 *||Jul 31, 1969||Mar 21, 1972||Keuffel & Esser Co||Photoresist compositions containing limed rosin and photoactinator|
|US3650797 *||May 18, 1970||Mar 21, 1972||Kalle Ag||Developing electrostatic latent images with a mixture of positive and negative toners|
|US3654865 *||Feb 5, 1970||Apr 11, 1972||Fuji Photo Film Co Ltd||Method for forming dye image using an electrophotographic developer containing a gelatin toner|
|US3669850 *||Jul 18, 1969||Jun 13, 1972||Draca Cedo||Method for the production of abrasive brushing elements|
|US3718593 *||Feb 5, 1970||Feb 27, 1973||Fuji Photo Film Co Ltd||Process for the production of an electrophotographic liquid developer containing gelatin|
|US3755177 *||Feb 3, 1970||Aug 28, 1973||Xerox Corp||Process of making liquid electrostatic developers containing gelatin|
|US3764538 *||Mar 10, 1971||Oct 9, 1973||Addressograph Multigraph||Electroscopic printing powder|
|US3791823 *||Feb 18, 1970||Feb 12, 1974||Xerox Corp||Photoelectrophoretic imaging transfer method|
|US3884687 *||Nov 13, 1969||May 20, 1975||Union Carbide Corp||Electrostatic printing process|
|US3907559 *||Mar 14, 1973||Sep 23, 1975||Xerox Corp||Imaging process employing friction charging in the presence of an electrically insulating developer liquid|
|US3933488 *||May 16, 1973||Jan 20, 1976||Fuji Photo Film Co., Ltd.||Information display method|
|US3935008 *||Jun 21, 1973||Jan 27, 1976||Hoechst Aktiengesellschaft||Electrophotographic process having developed hydrophilic image areas|
|US3951652 *||Jul 17, 1974||Apr 20, 1976||Fuji Photo Film Co., Ltd.||Method of forming image on sulfur based photosensitive member|
|US3958988 *||Feb 19, 1974||May 25, 1976||A. B. Dick Company||Photoconductors having improved sensitivity by presence of a like polar fields during imaging|
|US3958989 *||Aug 8, 1974||May 25, 1976||Xerox Corporation||Transparency support material for electrophotographic process|
|US3959934 *||Oct 4, 1974||Jun 1, 1976||Xerox Corporation||Composition and method for repairing selenium photoreceptors|
|US3960555 *||Apr 3, 1967||Jun 1, 1976||Xerox Corporation||Photographic charging and imaging process|
|US3965021 *||Sep 15, 1970||Jun 22, 1976||Xerox Corporation||Electrostatographic toners using block copolymers|
|US3967959 *||Dec 13, 1973||Jul 6, 1976||Xerox Corporation||Migration imaging system|
|US3971658 *||Apr 24, 1975||Jul 27, 1976||Xerox Corporation||Imaging process employing friction charging in the presence of an electrically insulating liquid|
|US3977871 *||Aug 15, 1975||Aug 31, 1976||International Business Machines Corporation||Electrophotographic developer with fibers of polytetrafluoroethylene|
|US4012250 *||Jan 2, 1970||Mar 15, 1977||Xerox Corporation||Imaging system|
|US4014696 *||Feb 5, 1975||Mar 29, 1977||Xerox Corporation||Multicolored xerographic transparency utilizing an aliphatic ester coating|
|US4021358 *||Jul 3, 1975||May 3, 1977||Konishiroku Photo Industry Co., Ltd.||Toner for developing electrostatic latent images|
|US4046505 *||Jul 31, 1972||Sep 6, 1977||Imperial Chemical Industries Limited||Post dyeing resin particles fixed to resin base|
|US4081273 *||Jul 13, 1970||Mar 28, 1978||Xerox Corporation||Migration imaging method|
|US4226930 *||Nov 8, 1978||Oct 7, 1980||Nippon Paint Co., Ltd.||Electrophotographic method for producing photopolymer printing plate|
|US4299898 *||May 3, 1979||Nov 10, 1981||Xerox Corporation||Positively charged toners containing quaternary ammonium salts attached to acrylate polymers|
|US4314017 *||Jan 19, 1979||Feb 2, 1982||Canon Kabushiki Kaisha||Developer without carrier powder having an improved triboelectric charging property|
|US4337303 *||Aug 11, 1980||Jun 29, 1982||Minnesota Mining And Manufacturing Company||Transfer, encapsulating, and fixing of toner images|
|US4340660 *||Apr 28, 1980||Jul 20, 1982||Canon Kabushiki Kaisha||Toner for development having crosslinked polymers|
|US4359516 *||Nov 21, 1980||Nov 16, 1982||E. I. Du Pont De Nemours And Company||Magnetic resist printing process, composition, and apparatus|
|US4373469 *||Jan 30, 1981||Feb 15, 1983||Canon Kabushiki Kaisha||Apparatus for developing electrostatic latent images|
|US4374212 *||Jul 29, 1981||Feb 15, 1983||Xerox Corporation||Sheet handling device|
|US4391512 *||Dec 28, 1979||Jul 5, 1983||Canon Kabushiki Kaisha||Developing device using magnetic developer|
|US4459344 *||Jul 15, 1981||Jul 10, 1984||Ezekiel Jacob J||Method for producing raised images by xerographic means|
|US4470693 *||Jan 11, 1982||Sep 11, 1984||Pitney Bowes Inc.||Self-cleaning xerographic apparatus|
|US4472491 *||May 26, 1982||Sep 18, 1984||Hoechst Aktiengesellschaft||Electrophotographic recording material having protective layer and process for the production thereof|
|US4481274 *||Nov 6, 1981||Nov 6, 1984||Canon Kabushiki Kaisha||Developing powder having oinylic, crosslinked binder and olefin polymer|
|US4499168 *||Apr 27, 1984||Feb 12, 1985||Canon Kabushiki Kaisha||Fixing method|
|US4504563 *||Apr 9, 1980||Mar 12, 1985||Fuji Xerox Co., Ltd.||Toner for developing electrostatic latent image containing copolymer of vinyl compound and acid monomer|
|US4507376 *||Jul 15, 1983||Mar 26, 1985||Arakawa Kagaku Kogyo Kabushiki Kaisha||Electrophotographic toner composition|
|US4518672 *||May 16, 1983||May 21, 1985||Canon Kabushiki Kaisha||Cyan color toner for developing electrostatic image|
|US4533614 *||May 31, 1983||Aug 6, 1985||Canon Kabushiki Kaisha||Heat-fixable dry system toner|
|US4533616 *||May 25, 1983||Aug 6, 1985||Canon Kabushiki Kaisha||Developer for electrophotography of toner and microencapsulated additive|
|US4533617 *||May 23, 1983||Aug 6, 1985||Canon Kabushiki Kaisha||Heat fixing developer of capsule structure|
|US4565766 *||Jul 20, 1984||Jan 21, 1986||Canon Kabushiki Kaisha||Developing powder|
|US4590139 *||Oct 21, 1985||May 20, 1986||Canon Kabushiki Kaisha||Three color toner kit and method of use|
|US4599289 *||Mar 22, 1985||Jul 8, 1986||Canon Kabushiki Kaisha||Pressure-fixable encapsulated toner|
|US4705696 *||Sep 27, 1984||Nov 10, 1987||Olin Hunt Specialty Products Inc.||Method of making a lithographic printing plate, printing plates made by the method, and the use of such printing plates to make lithographic prints|
|US4731634 *||Nov 3, 1986||Mar 15, 1988||Xerox Corporation||Apparatus for printing black and plural highlight color images in a single pass|
|US4737431 *||Oct 8, 1986||Apr 12, 1988||Faco Corporation Ltd.||Negative-electrification finely-divided toner in use for electrophotography|
|US4761668 *||Sep 29, 1986||Aug 2, 1988||Xerox Corporation||Highlight color printer|
|US4761672 *||Jul 28, 1987||Aug 2, 1988||Xerox Corporation||Ramped developer biases|
|US4771314 *||Dec 29, 1986||Sep 13, 1988||Xerox Corporation||Developer apparatus for a highlight printing apparatus|
|US4786939 *||Aug 18, 1986||Nov 22, 1988||Konishiroku Photo Industry Co., Ltd.||Image forming apparatus|
|US4857433 *||Oct 8, 1987||Aug 15, 1989||Mitsui Toatsu Chemicals, Incorporated||Electrophotographic toner for high speed electrophotography|
|US4859411 *||Apr 8, 1988||Aug 22, 1989||Xerox Corporation||Control of selenium alloy fractionation|
|US4863825 *||Nov 9, 1987||Sep 5, 1989||Arakawa Kagaku Kogyo Kabushiki Kaisha||Low temperature electrophotographic toner composition comprising nonlinear polyester resin|
|US4877704 *||Apr 28, 1988||Oct 31, 1989||Konishiroku Photo Industry Co., Ltd.||Process for developing latent electrostatic image using toner containing polyester resin|
|US4931375 *||May 19, 1989||Jun 5, 1990||Konishiroku Photo Industry Co., Ltd.||Powdered electrostatic image developing toner|
|US4946755 *||May 8, 1989||Aug 7, 1990||Canon Kabushiki Kaisha||Electrophotographic one component magnetic toner comprising hydrophobic silica and iron oxide|
|US4966829 *||Nov 23, 1988||Oct 30, 1990||Canon Kabushiki Kaisha||Toner for developing electrostatic images, binder therefor and process for production thereof|
|US4978596 *||Mar 17, 1986||Dec 18, 1990||Hitachi, Ltd.||Electrophotographic toner comprising lactone-modified epoxy resin|
|US4988591 *||May 4, 1989||Jan 29, 1991||Hoechst Aktiengesellschaft||Process for producing color images|
|US5021318 *||Jul 28, 1989||Jun 4, 1991||Xerox Corporation||Process for forming secure images|
|US5066558 *||Sep 29, 1989||Nov 19, 1991||Canon Kabushiki Kaisha||Developer for developing electrostatic images|
|US5084369 *||Mar 13, 1990||Jan 28, 1992||Canon Kabushiki Kaisha||Toner containing a dimer of diarylguanidine type compound for developing electrostatic image|
|US5106715 *||Feb 6, 1989||Apr 21, 1992||Fuji Xerox Co., Ltd.||Toner composition with polyethylene and inorganic external additive|
|US5112714 *||Nov 19, 1990||May 12, 1992||Canon Kabushiki Kaisha||Dry magnetic electrostatic developer|
|US5126224 *||Sep 14, 1990||Jun 30, 1992||Canon Kabushiki Kaisha||Electrostatic image developing toner and process for its production, and binder resin and process for its production|
|US5135833 *||Jan 18, 1991||Aug 4, 1992||Canon Kabushiki Kaisha||Electrostatic image developing toner and fixing method|
|US5147753 *||Sep 19, 1990||Sep 15, 1992||Canon Kabushiki Kaisha||Process for producing toner for developing electrostatic image|
|US5166041 *||Jul 22, 1991||Nov 24, 1992||Showa Denko K.K.||Near infrared ray-decolorizable recording material|
|US5169738 *||Oct 29, 1990||Dec 8, 1992||Canon Kabushiki Kaisha||Toner for developing electrostatic images, image forming method and image forming apparatus|
|US5173387 *||Feb 14, 1992||Dec 22, 1992||Kao Corporation||Electrophotographic dry developer|
|US5175070 *||Sep 26, 1990||Dec 29, 1992||Canon Kabushiki Kaisha||Image forming method and image forming apparatus|
|US5180649 *||Nov 9, 1990||Jan 19, 1993||Canon Kabushiki Kaisha||Toner having crosslinkages and method of fixing same|
|US5185496 *||Mar 4, 1991||Feb 9, 1993||Canon Kabushiki Kaisha||Electrostatic latent image device having a coating layer provided on a developer carrying member|
|US5202213 *||Jan 21, 1992||Apr 13, 1993||Canon Kabushiki Kaisha||Developer with surface treated silicic acid for developing electrostatic image|
|US5202731 *||Aug 26, 1992||Apr 13, 1993||Canon Kabushiki Kaisha||Image forming apparatus having an alternating bias electric field|
|US5208093 *||Nov 5, 1991||May 4, 1993||Minnesota Mining And Manufacturing Company||Film construction for use in a plain paper copier|
|US5212524 *||Aug 31, 1992||May 18, 1993||Canon Kabushiki Kaisha||Toner for developing electrostatic images, image forming method and image forming apparatus|
|US5214208 *||Sep 24, 1991||May 25, 1993||Canon Kabushiki Kaisha||Toner containing a dimer of diarylguanidine type compound for developing electrostatic image|
|US5215848 *||Oct 31, 1990||Jun 1, 1993||Canon Kabushiki Kaisha||Carrier for electrophotography, two-component type developer, process for producing carrier and image forming method|
|US5215854 *||Oct 4, 1989||Jun 1, 1993||Canon Kabushiki Kaisha||Process for producing microcapsule toner|
|US5217836 *||Nov 9, 1990||Jun 8, 1993||Canon Kabushiki Kaisha||Toner for developing electrostatic images|
|US5219697 *||Mar 8, 1991||Jun 15, 1993||Canon Kabushiki Kaisha||Toner for developing electrostatic image comprising color resin particles having an irregular shape|
|US5219946 *||Nov 8, 1990||Jun 15, 1993||Canon Kk||Binder resin and process for producing it|
|US5225308 *||Apr 4, 1991||Jul 6, 1993||Kao Corporation||Encapsulated toner for heat-and-pressure fixing|
|US5234787 *||Dec 30, 1991||Aug 10, 1993||Kao Corporation||Developer composition for electrophotography|
|US5234788 *||Dec 30, 1991||Aug 10, 1993||Kao Corporation||Developer composition for electrophotography|
|US5241019 *||Jul 12, 1991||Aug 31, 1993||Mitsui Toatsu Chemicals, Inc.||Binder for dry toner|
|US5246810 *||Oct 18, 1990||Sep 21, 1993||Canon Kabushiki Kaisha||Guanidine type compound, toner for developing electrostatic images, developer for developing electrostatic images|
|US5250382 *||Dec 26, 1991||Oct 5, 1993||Canon Kabushiki Kaisha||Toner for developing electrostatic image, and image fixing method|
|US5260748 *||May 28, 1992||Nov 9, 1993||Infographix, Inc.||Electrostatic image developer dispenser|
|US5262259 *||Apr 18, 1990||Nov 16, 1993||Minnesota Mining And Manufacturing Company||Toner developed electrostatic imaging process for outdoor signs|
|US5268248 *||Nov 26, 1991||Dec 7, 1993||Canon Kabushiki Kaisha||Toner for developing electrostatic image and process for production thereof|
|US5283148 *||Sep 18, 1992||Feb 1, 1994||Minnesota Mining And Manufacturing Company||Liquid toners for use with perfluorinated solvents|
|US5288579 *||Dec 2, 1991||Feb 22, 1994||Canon Kabushiki Kaisha||Developer for developing electrostatic image, image forming apparatus, apparatus unit and facsimile apparatus|
|US5298309 *||Feb 24, 1993||Mar 29, 1994||Minnesota Mining And Manufacturing Company||Film construction for use in a plain paper copier|
|US5298354 *||Mar 23, 1992||Mar 29, 1994||Canon Kabushiki Kaisha||Electrostatic image developing toner and fixing method|
|US5300386 *||Mar 20, 1992||Apr 5, 1994||Canon Kabushiki Kaisha||Developer for developing electrostatic image, image forming method and heat fixing method|
|US5306588 *||Mar 19, 1992||Apr 26, 1994||Canon Kabushiki Kaisha||Treated silica fine powder and toner for developing electrostatic images|
|US5318872 *||Apr 2, 1993||Jun 7, 1994||Xerox Corporation||Toner and developer compositions with fluorophosphate charge enhancing additives|
|US5321091 *||Nov 18, 1992||Jun 14, 1994||Canon Kabushiki Kaisha||Binder resin used in a toner|
|US5322752 *||Apr 19, 1991||Jun 21, 1994||Xerox Corporation||Development process for abrasion resistant documents|
|US5330870 *||Aug 31, 1992||Jul 19, 1994||Kao Corporation||Developer composition for electrophotography for flash fusing|
|US5330871 *||Nov 26, 1991||Jul 19, 1994||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5332640 *||Jul 20, 1993||Jul 26, 1994||Xerox Corporation||Toner compositions with dendrimer charge enhancing additives|
|US5338638 *||Nov 26, 1991||Aug 16, 1994||Canon Kabushiki Kaisha||Toner for developing electrostatic image and process for production thereof|
|US5338894 *||Sep 20, 1991||Aug 16, 1994||Canon Kabushiki Kaisha||Image forming method with improved development|
|US5348829 *||Nov 6, 1992||Sep 20, 1994||Canon Kabushiki Kaisha||Monocomponent-type developer for developing electrostatic image and image forming method|
|US5354640 *||Sep 21, 1992||Oct 11, 1994||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5356749 *||Jun 23, 1993||Oct 18, 1994||Canon Kabushiki Kaisha||Imaging method comprising a developer having a novel guanidine type compound|
|US5363180 *||May 15, 1992||Nov 8, 1994||Hitachi Koki Co. Ltd.||Fixing device for electrophotography and electrophotographic apparatus incorporating the fixing device|
|US5364722 *||Sep 10, 1992||Nov 15, 1994||Canon Kabushiki Kaisha||Toner for developing electrostatic image and heat-fixing method comprising a hydrocarbon wax|
|US5378570 *||Dec 29, 1993||Jan 3, 1995||Fuji Xerox Co., Ltd.||Electrophotographic photoreceptor|
|US5384224 *||Mar 4, 1993||Jan 24, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5389484 *||Feb 17, 1994||Feb 14, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic images, image forming apparatus, apparatus unit and facsimile apparatus|
|US5389487 *||May 3, 1994||Feb 14, 1995||Canon Kabushiki Kaisha||Image forming process, image-forming apparatus, apparatus unit, and facsimile apparatus|
|US5391247 *||May 6, 1994||Feb 21, 1995||Revlon Consumer Products Corporation||Hot stamping glass|
|US5391450 *||Apr 22, 1994||Feb 21, 1995||Canon Kabushiki Kaisha||Toner image heat-fixing method|
|US5406357 *||Aug 19, 1994||Apr 11, 1995||Canon Kabushiki Kaisha||Developer for developing electrostatic image, image forming method, image forming apparatus and apparatus unit|
|US5407769 *||Nov 26, 1993||Apr 18, 1995||Canon Kabushiki Kaisha||Magnetic toner having triaryl methyl organic resin|
|US5407776 *||Aug 25, 1994||Apr 18, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5418102 *||Nov 27, 1991||May 23, 1995||Canon Kabushiki Kaisha||Developer for developing electrostatic image, image forming method, toner imager fixing method and image forming apparatus|
|US5422215 *||Jan 26, 1994||Jun 6, 1995||Canon Kabushiki Kaisha||Magnetic toner|
|US5422707 *||Sep 13, 1994||Jun 6, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic images, detachable apparatus, image forming apparatus and facsimile apparatus|
|US5424810 *||Sep 10, 1992||Jun 13, 1995||Canon Kabushiki Kaisha||Magnetic toner, magnetic developer, apparatus unit, image forming apparatus and facsimile apparatus|
|US5436701 *||Nov 16, 1994||Jul 25, 1995||Canon Kabushiki Kaisha||Image forming method, image forming apparatus and apparatus unit|
|US5437949 *||Jun 23, 1994||Aug 1, 1995||Canon Kabushiki Kaisha||Color toner and process for its production|
|US5439769 *||Dec 14, 1993||Aug 8, 1995||Seiko Epson Corporation||Developing method and system|
|US5439770 *||Apr 15, 1994||Aug 8, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic image, image forming apparatus and process cartridge|
|US5439771 *||Jul 28, 1993||Aug 8, 1995||Canon Kabushiki Kaisha||Carrier for use in electrophotography, two component-type developer and image forming method|
|US5447813 *||Dec 2, 1994||Sep 5, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic image and image forming method|
|US5447815 *||Jun 3, 1993||Sep 5, 1995||Canon Kabushiki Kaisha||Developer for developing electrostatic image and image forming method|
|US5470687 *||Apr 26, 1994||Nov 28, 1995||Canon Kabushiki Kaisha||Process for producing toner particles using free space formed in a polymeric medium|
|US5476745 *||Jan 27, 1995||Dec 19, 1995||Canon Kabushiki Kaisha||Process for producing toner particles|
|US5483327 *||Mar 6, 1995||Jan 9, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image, forming apparatus and process cartridge|
|US5489498 *||Jan 18, 1994||Feb 6, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image and method of manufacturing resin composition|
|US5494770 *||May 26, 1995||Feb 27, 1996||Canon Kabushiki Kaisha||Image forming method using magnetic brush and specific carrier|
|US5500046 *||Nov 2, 1994||Mar 19, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic images, image forming apparatus, apparatus unit and facsimile apparatus|
|US5500318 *||Jun 27, 1994||Mar 19, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image and fixing method|
|US5503904 *||Jan 19, 1994||Apr 2, 1996||Canon Kabushiki Kaisha||Invisible information recorded medium|
|US5504272 *||May 20, 1994||Apr 2, 1996||Canon Kabushiki Kaisha||Magnetic toner having defined particle distribution|
|US5508138 *||Sep 28, 1994||Apr 16, 1996||Hitachi Koki Co., Ltd.||Fixing device for electrophotography and electrophotographic apparatus incorporating the fixing device|
|US5508139 *||Mar 22, 1994||Apr 16, 1996||Canon Kabushiki Kaisha||Magnetic toner for developing electrostatic image|
|US5510222 *||May 17, 1994||Apr 23, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image and process for production thereof|
|US5512402 *||May 19, 1994||Apr 30, 1996||Canon Kabushiki Kaisha||Carrier for electrophotography, two-component type developer, and image forming method|
|US5512406 *||Oct 12, 1994||Apr 30, 1996||Canon Kabushiki Kaisha||Toners of different size for electrophotography|
|US5517286 *||Jan 28, 1994||May 14, 1996||Canon Kabushiki Kaisha||Developing apparatus|
|US5519479 *||Aug 22, 1995||May 21, 1996||Hitachi Koki Co., Ltd.||Fixing device for electrophotography and electrophotographic apparatus incorporating the fixing device|
|US5521271 *||Sep 29, 1994||May 28, 1996||Minnesota Mining And Manufacturing Company||Liquid toners with hydrocarbon solvents|
|US5523190 *||Dec 14, 1994||Jun 4, 1996||Canon Kabushiki Kaisha||Magnetic toner and recording method|
|US5523533 *||May 26, 1994||Jun 4, 1996||Canon Kabushiki Kaisha||Developing device which restricts carrier using developing agent regulating rotary member|
|US5529873 *||Apr 18, 1994||Jun 25, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic images and process for producing toner|
|US5530053 *||May 24, 1995||Jun 25, 1996||Minnesota Mining And Manufacturing Company||Liquid toners utilizing highly fluorinated solvents|
|US5530067 *||May 17, 1994||Jun 25, 1996||Minnesota Mining And Manufacturing Company||Liquid toners utilizing highly fluorinated solvents|
|US5535185 *||Jan 21, 1994||Jul 9, 1996||Canon Kabushiki Kaisha||Information recording/reproduction apparatus using probe|
|US5536612 *||Mar 7, 1994||Jul 16, 1996||Kao Corporation||Encapsulated toner for heat-and-pressure fixing and method for production thereof|
|US5547796 *||Jul 18, 1994||Aug 20, 1996||Canon Kabushiki Kaisha||Developer containing insulating magnetic toner flowability-improving agent and inorganic fine powder|
|US5558967 *||Oct 31, 1994||Sep 24, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image and two-component type developer for developing electrostatic image|
|US5565291 *||Mar 25, 1994||Oct 15, 1996||Canon Kabushiki Kaisha||Carrier for use in electrophotography and two component-type developer containing the carrier|
|US5565293 *||Mar 9, 1995||Oct 15, 1996||Kao Corporation||Encapsulated toner for heat-and-pressure fixing|
|US5567567 *||Nov 2, 1994||Oct 22, 1996||Kao Corporation||Method for producing encapsulated toner for heat-and-pressure fixing and encapsulated toner obtained thereby|
|US5571652 *||Aug 17, 1994||Nov 5, 1996||Kao Corporation||Encapsulated toner for heat-and-pressure fixing and method for producing the same|
|US5571653 *||Oct 19, 1994||Nov 5, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic images, and process for its production|
|US5573880 *||Dec 27, 1994||Nov 12, 1996||Canon Kabushiki Kaisha||Carrier for electrophotography, process for its production, two-component type developer, and image forming method|
|US5576133 *||Jul 13, 1995||Nov 19, 1996||Canon Kabushiki Kaisha||Carrier for use in electrophotography, two component-type developer and image forming method|
|US5578407 *||Oct 28, 1994||Nov 26, 1996||Canon Kabushiki Kaisha||Color toner for developing electrostatic images, process for its production, and color image forming method|
|US5578408 *||Dec 29, 1994||Nov 26, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5578409 *||Nov 15, 1995||Nov 26, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image, one component-type developer and two-component type developer|
|US5582950 *||Apr 17, 1995||Dec 10, 1996||Fujitsu Limited||Process for producing flash fusing color toner|
|US5585483 *||Oct 20, 1995||Dec 17, 1996||Fuji Electric., Ltd.||Metal-free phythalocyanine, process for preparing the same, and electrophotographic photoconductor using the same|
|US5591555 *||Jan 10, 1995||Jan 7, 1997||Fuji Electric Co., Ltd.||Electrophotographic photoconductor including a metal-free phthalocyanine|
|US5592266 *||Sep 8, 1995||Jan 7, 1997||Samsung Electronics Co., Ltd.||Electrophotographic process cartridge|
|US5599886 *||Feb 22, 1996||Feb 4, 1997||Minnesota Mining And Manufacturing Company||Liquid toners with hydrocarbon solvents|
|US5604070 *||Feb 17, 1995||Feb 18, 1997||Minnesota Mining And Manufacturing Company||Liquid toners with hydrocarbon solvents|
|US5604071 *||Feb 23, 1995||Feb 18, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5604072 *||Sep 19, 1995||Feb 18, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic images, image forming method and process cartridge|
|US5604074 *||May 1, 1995||Feb 18, 1997||Kao Corporation||Method of development of nonmagnetic one-component toner and method for forming fixed images using the development|
|US5607805 *||Jul 5, 1995||Mar 4, 1997||Kao Corporation||Toner for electrophotography and developer composition containing the same|
|US5614344 *||Jun 13, 1995||Mar 25, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic images and image forming method|
|US5618648 *||Jul 12, 1995||Apr 8, 1997||Fujitsu Limited||Toner binder, toner, electrophotographic method and apparatus therefor|
|US5629122 *||Jun 6, 1995||May 13, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image and image forming method|
|US5634181 *||Feb 15, 1994||May 27, 1997||Fuji Xerox Co., Ltd.||Developing apparatus|
|US5635326 *||Feb 9, 1995||Jun 3, 1997||Canon Kabushiki Kaisha||Electrostatic image-developing toner, fine powdery titanium oxide, and hydrophobic fine powdery titanium oxide|
|US5641600 *||Jul 31, 1995||Jun 24, 1997||Canon Kabushiki Kaisha||Magnetic toner and image forming method|
|US5649273 *||Mar 6, 1996||Jul 15, 1997||Hitachi Koki Co., Ltd.||Belt-type fixing device having an irregular surface contour|
|US5659858 *||May 11, 1995||Aug 19, 1997||Seiko Epson Corporation||Developing method and system|
|US5660963 *||Nov 28, 1995||Aug 26, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5663024 *||Nov 1, 1996||Sep 2, 1997||Minnesota Mining And Manufacturing Company||Liquid toners with hydrocarbon solvents|
|US5663026 *||Mar 20, 1996||Sep 2, 1997||Canon Kabushiki Kaisha||Magnetic toner, process cartridge and image forming method|
|US5665513 *||Aug 29, 1996||Sep 9, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic charged image|
|US5670288 *||Feb 12, 1996||Sep 23, 1997||Canon Kabushiki Kaisha||Carrier for electrophotography, two-component type developer, and image forming method|
|US5679490 *||May 30, 1996||Oct 21, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic images, and process for producing the same|
|US5700616 *||Jan 31, 1996||Dec 23, 1997||Canon Kabushiki Kaisha||Developer for developing an electrostatic image and image forming method|
|US5700617 *||Oct 8, 1996||Dec 23, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic images and charge-controlling agent|
|US5707770 *||Nov 8, 1995||Jan 13, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images, two component type developer, developing method, image forming method, heat fixing method, and process for producing toner|
|US5707771 *||Dec 20, 1995||Jan 13, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5712069 *||Sep 29, 1995||Jan 27, 1998||Canon Kabushiki Kaisha||Two-component type developer, developing method and image forming method|
|US5712072 *||Feb 22, 1996||Jan 27, 1998||Canon Kabusbiki Kaisha||Toner for developing electrostatic image|
|US5712073 *||Dec 31, 1996||Jan 27, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image, apparatus unit and image forming method|
|US5716746 *||May 23, 1994||Feb 10, 1998||Canon Kabushiki Kaisha||Magnetic toner and process for producing magnetic toner|
|US5716751 *||Apr 1, 1996||Feb 10, 1998||Xerox Corporation||Toner particle comminution and surface treatment processes|
|US5736282 *||May 13, 1996||Apr 7, 1998||Fuji Electric Co., Ltd.||Electrophotographic photoreceptors including titanyloxyphthalocyanine crystals|
|US5736288 *||May 15, 1995||Apr 7, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images, process cartridge, and image forming method|
|US5741617 *||Jun 1, 1995||Apr 21, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images|
|US5744278 *||Apr 8, 1997||Apr 28, 1998||Canon Kabushiki Kaisha||Toner for developing an electrostatic image and process for producing a toner|
|US5747209 *||Apr 30, 1996||May 5, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images containing aromatic hydroxycarboxylic acid and metal compound of the aromatic hydroxycarboxylic acid|
|US5747213 *||May 29, 1996||May 5, 1998||Canon Kabushiki Kaisha||Image forming method and heat fixing method using a toner including a wax|
|US5750302 *||Mar 24, 1997||May 12, 1998||Canon Kabushiki Kaisha||Magnetic toner for developing electrostatic image, image forming process, and process cartridge|
|US5750303 *||Apr 30, 1997||May 12, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5750304 *||Apr 16, 1996||May 12, 1998||Kao Corporation||Encapsulated toner for heat-and-pressure fixing and method for producing the same|
|US5753399 *||May 15, 1996||May 19, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image containing crosslined styrene copolymer and a new-crosslinked or crosslinked polyester resin|
|US5753763 *||Oct 30, 1996||May 19, 1998||Minnesota Mining And Manufacturing Company||Process for preparing liquid toners with hydrocarbon solvents|
|US5766813 *||Jun 4, 1996||Jun 16, 1998||Seiko Epson Corporation||Developing method and system for transferring toner from a toner carrier member to a latent image carrier|
|US5773183 *||Nov 15, 1996||Jun 30, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images|
|US5773185 *||Aug 15, 1997||Jun 30, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images, and process for producing the same|
|US5789132 *||Jun 10, 1997||Aug 4, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images containing fine powder fluidity improver and, one-component developer, and two-component developer, containing this toner|
|US5795694 *||May 16, 1996||Aug 18, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5802440 *||Jul 1, 1996||Sep 1, 1998||Canon Kabushiki Kaisha||Cleaning apparatus for cleaning heat fixing member, heat fixing method and image forming method|
|US5824442 *||Aug 28, 1997||Oct 20, 1998||Canon Kabushiki Kaisha||Developing method, image forming method, and heat fixing method, with toner|
|US5824800 *||Jun 21, 1996||Oct 20, 1998||Fuji Electric Co., Ltd.||Process for preparing a metal-free phthalocyanine|
|US5827632 *||Aug 12, 1997||Oct 27, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image containing hydrophobized inorganic fine powder|
|US5840459 *||Jun 12, 1996||Nov 24, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic images and process for production thereof|
|US5846682 *||Feb 13, 1997||Dec 8, 1998||Showa Denko K.K.||Light decolorizable recording material, ink and toner|
|US5849453 *||Jun 8, 1993||Dec 15, 1998||Canon Kabushiki Kaisha||Image forming method including recycling of untransferred toner collected from image bearing member to developing means|
|US5851714 *||Mar 28, 1997||Dec 22, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image and fixing method|
|US5853938 *||Jan 21, 1994||Dec 29, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5854365 *||Dec 19, 1995||Dec 29, 1998||Canon Kabushiki Kaisha||Toner for developing electrostatic image and method of manufacturing resin composition|
|US5858597 *||Aug 30, 1996||Jan 12, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image containing specified double oxide particles|
|US5863695 *||Nov 22, 1996||Jan 26, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image and image forming method|
|US5863697 *||Apr 2, 1998||Jan 26, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image and process for production thereof|
|US5874570 *||Jan 26, 1998||Feb 23, 1999||Fuji Electric Co., Ltd.||Titanyloxyphthalocyanine crystals, and method of preparing the same|
|US5885742 *||Oct 3, 1997||Mar 23, 1999||Canon Kabushiki Kaisha||Carrier for electrophotography, two-component type developer, and image forming method|
|US5916726 *||Feb 6, 1998||Jun 29, 1999||Canon Kabushiki Kaisha||Process for producing toner for developing electrostatic images|
|US5919866 *||Feb 9, 1998||Jul 6, 1999||Minnesota Mining And Manufacturing Company||Liquid toners with hydrocarbon solvents|
|US5922500 *||Nov 19, 1997||Jul 13, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US5935751 *||Jun 25, 1997||Aug 10, 1999||Fuji Xerox Co., Ltd.||Toner for developing electrostatic latent image, process for manufacturing the same, developer for electrostatic latent image, and image-forming method|
|US5955234 *||Oct 8, 1997||Sep 21, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image, and image forming method|
|US5962176 *||Jan 30, 1997||Oct 5, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image, image forming method and process-cartridge|
|US5972553 *||Oct 25, 1996||Oct 26, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image, process-cartridge and image forming method|
|US5976752 *||Aug 18, 1998||Nov 2, 1999||Canon Kabushiki Kaisha||Toner and image forming method|
|US5985502 *||Dec 18, 1997||Nov 16, 1999||Canon Kabushiki Kaisha||Toner for developing an electrostatic image and process for producing a toner|
|US5986017 *||Sep 14, 1995||Nov 16, 1999||Fujitsu Limited||Toner binder for flash fixing, toner, electrostatic photographic printing method and apparatus therefor|
|US5998080 *||Aug 28, 1998||Dec 7, 1999||Canon Kabushiki Kaisha||Electrostatic image-developing toner and image-forming method|
|US6001524 *||Mar 19, 1998||Dec 14, 1999||Hna Holdings, Inc.||Toner particles for electrophotographic imaging applications|
|US6001525 *||Nov 19, 1997||Dec 14, 1999||Canon Kabushiki Kaisha||Electrophotographic developer carrier, two-component type developer and image forming method|
|US6001527 *||Dec 19, 1997||Dec 14, 1999||Fuji Xerox Co., Ltd.||Electrostatic charge image developer, image formation method and image forming device|
|US6002895 *||Jul 15, 1997||Dec 14, 1999||Canon Kabushiki Kaisha||Process cartridge|
|US6002903 *||Jan 14, 1998||Dec 14, 1999||Canon Kabushiki Kaisha||Toner for developing electrostatic image, apparatus unit and image forming method|
|US6010811 *||Aug 13, 1997||Jan 4, 2000||Canon Kabushiki Kaisha||Two-component type developer, developing method and image forming method|
|US6013406 *||Mar 11, 1998||Jan 11, 2000||Canon Kabushiki Kaisha||Toner for developing electrostatic images, and image-forming method|
|US6016414 *||Dec 5, 1995||Jan 18, 2000||Canon Kabushiki Kaisha||Electrophotographic photosensitive member, electrophotographic apparatus and process cartridge|
|US6017669 *||Sep 18, 1996||Jan 25, 2000||Canon Kabushiki Kaisha||Toner for developing an electrostatic image|
|US6020102 *||Jul 2, 1998||Feb 1, 2000||Canon Kabushiki Kaisha||Positive-chargeable toner, image forming method and apparatus unit|
|US6040103 *||Sep 2, 1997||Mar 21, 2000||Canon Kabushiki Kaisha||Toner for developing electrostatic image and image forming method|
|US6054244 *||Dec 23, 1998||Apr 25, 2000||Canon Kabushiki Kaisha||Process for producing toner|
|US6077638 *||Mar 21, 1997||Jun 20, 2000||Canon Kabushiki Kaisha||Toner and developer for developing electrostatic image, process for production thereof and image forming method|
|US6090515 *||May 23, 1997||Jul 18, 2000||Canon Kabushiki Kaisha||Toner for developing electrostatic image, image forming method and process cartridge|
|US6106990 *||Jul 29, 1999||Aug 22, 2000||Canon Kabushiki Kaisha||Process for producing toner particles|
|US6120655 *||Jan 20, 1998||Sep 19, 2000||Fuji Photo Film Co., Ltd.||Process for producing printing plate for platemaking by ink-jet system|
|US6124067 *||Jul 22, 1999||Sep 26, 2000||Canon Kabushiki Kaisha||Magnetic carrier, two-component developer and image forming method|
|US6124070 *||Sep 21, 1999||Sep 26, 2000||Canon Kabushiki Kaisha||Toner and process for producing toner|
|US6146801 *||Sep 29, 1999||Nov 14, 2000||Canon Kabushiki Kaisha||Resin-coated carrier, two component type developer, and developing method|
|US6153879 *||Mar 27, 1996||Nov 28, 2000||Canon Kabushiki Kaisha||Invisible information detecting apparatus|
|US6156470 *||Jul 28, 1999||Dec 5, 2000||Canon Kabushiki Kaisha||Toner having negative triboelectric chargeability and image forming method|
|US6156471 *||Jan 19, 2000||Dec 5, 2000||Canon Kabushiki Kaisha||Toner and image forming method|
|US6159648 *||Aug 13, 1999||Dec 12, 2000||Canon Kabushiki Kaisha||Two-component type developer, developing method and image forming method|
|US6187496||Mar 20, 1997||Feb 13, 2001||Canon Kabushiki Kaisha||Toner and developer for developing electrostatic image, process for production thereof and image forming method|
|US6203959||Mar 8, 2000||Mar 20, 2001||Canon Kabushiki Kaisha||Toner|
|US6219522||Sep 15, 1999||Apr 17, 2001||Canon Kabushiki Kaisha||Fuser and image forming apparatus|
|US6225017||Oct 27, 1998||May 1, 2001||Canon Kabushiki Kaisha||Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus having the electrophotographic photosensitive member|
|US6232027||May 26, 1999||May 15, 2001||Canon Kabushiki Kaisha||Toner having negative triboelectric chargeability and image forming method|
|US6235441||Dec 17, 1999||May 22, 2001||Canon Kabushiki Kaisha||Positively chargeable toner, image forming method and image forming apparatus|
|US6287742||May 16, 2000||Sep 11, 2001||Matsci Solutions, Inc.||Toner compositions and method of producing toner for developing latent electrostatic images|
|US6288166||Aug 17, 1994||Sep 11, 2001||Kao Corporation||Binder resin for toner and positively chargeable toner containing the same|
|US6294303||Jan 24, 2000||Sep 25, 2001||Nexpress Solutions Llc||Monocomponent developer containing positively chargeable fine power|
|US6300024||Jun 28, 2000||Oct 9, 2001||Canon Kabushiki Kaisha||Toner, two-component type developer, heat fixing method, image forming method and apparatus unit|
|US6309788||Nov 4, 1999||Oct 30, 2001||Canon Kabushiki Kaisha||Process for producing toner|
|US6312862||Nov 5, 1999||Nov 6, 2001||Canon Kabushiki Kaisha||Two-component type developer and image forming method|
|US6326114||Apr 13, 2000||Dec 4, 2001||Canon Kabushiki Kaisha||Toner, and process for producing a toner|
|US6342273||Feb 25, 2000||Jan 29, 2002||Dsm N.V.||Process for coating a substrate with a powder paint composition|
|US6365314||Dec 9, 1999||Apr 2, 2002||Canon Kabushiki Kaisha||Toner for developing electrostatic image, image forming method and process cartridge|
|US6372400||Jun 29, 2000||Apr 16, 2002||Canon Kabushiki Kaisha||Carrier for use in electrophotography, two-component type developer and image forming method|
|US6376148||Jan 17, 2001||Apr 23, 2002||Nanotek Instruments, Inc.||Layer manufacturing using electrostatic imaging and lamination|
|US6379482 *||May 30, 2000||Apr 30, 2002||Fujitsu Limited||Manufacturing device and method of the exposure device|
|US6381434||Nov 13, 1997||Apr 30, 2002||Canon Kabushiki Kaisha||Developing apparatus with electric field force directing a toner cloud for coating a developer carrying member|
|US6387583||Dec 9, 1999||May 14, 2002||Matsci Solutions, Inc.||Method of producing toner for developing latent electrostatic images by way of dispersion dyeing|
|US6389970 *||May 31, 2000||May 21, 2002||Fuji Photo Film Co., Ltd.||Direct drawing type lithographic printing plate precursor and method for producing lithographic printing plate using the same|
|US6397031||Aug 28, 2000||May 28, 2002||Canon Kabushiki Kaisha||Development apparatus with first and second developer carrying member and a plurality of magnetic field generating means for regulating developer layer thickness|
|US6403274||Apr 10, 2001||Jun 11, 2002||Fuji Xerox Co., Ltd.||Electrophotographic toner, process for preparing the same, and two-component developer|
|US6410195||Aug 7, 2000||Jun 25, 2002||Canon Kabushiki Kaisha||Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus|
|US6416917 *||Mar 28, 2000||Jul 9, 2002||Sanyo Chemical Industries Ltd.||Dry toners having specified condensation binder resins|
|US6424814||Feb 22, 2001||Jul 23, 2002||Canon Kabushiki Kaisha||Image forming apparatus using shaped toner particles and transfer roller pressure for fine image quality|
|US6426169||Oct 30, 2000||Jul 30, 2002||Canon Kabushiki Kaisha||Toner containing azo iron compound|
|US6436599||Jul 12, 2001||Aug 20, 2002||Fuji Xerox Co., Ltd.||Toner, method of producing toner, and image forming method using toner|
|US6447968||Dec 29, 1997||Sep 10, 2002||Canon Kabushiki Kaisha||Magnetic toner, process for producing magnetic toner, and image forming method|
|US6447970||Jun 7, 2000||Sep 10, 2002||Canon Kabushiki Kaisha||Toner containing aluminum benzilic acid compound and image forming method|
|US6458499||Jun 1, 2001||Oct 1, 2002||Canon Kabushiki Kaisha||Toner having hydrocarbon wax with specific ester value and hydroxyl value|
|US6461783||May 18, 2001||Oct 8, 2002||Dpi Solutions, Inc.||Micro-serrated color toner particles and method of making same|
|US6475686||Jul 26, 2001||Nov 5, 2002||Canon Kabushiki Kaisha||Fixing method|
|US6485875||Oct 26, 2000||Nov 26, 2002||Canon Kabushiki Kaisha||Toner and resin composition for the toner|
|US6493522||Jun 7, 2001||Dec 10, 2002||Canon Kabushiki Kaisha||Developing device and image forming apparatus|
|US6500593||Nov 29, 2001||Dec 31, 2002||Canon Kabushiki Kaisha||Toner, and toner production process|
|US6531255||May 18, 2001||Mar 11, 2003||Dpi Solutions, Inc.||Micro-serrated particles for use in color toner and method of making same|
|US6537715||Jul 26, 2001||Mar 25, 2003||Canon Kabushiki Kaisha||Toner, image-forming method and process cartridge|
|US6537716||Dec 4, 1996||Mar 25, 2003||Canon Kabushiki Kaisha||Toner for developing electrostatic images and heat fixing method|
|US6541174||Sep 1, 2000||Apr 1, 2003||Canon Kabushiki Kaisha||Method using toner and developer for developing electrostatic image|
|US6544705||May 18, 2001||Apr 8, 2003||Dpi Solutions, Inc.||Micro-serrated, dyed color toner particles and method of making same|
|US6544706 *||Feb 8, 1999||Apr 8, 2003||Nippon Zeon Co., Ltd.||Polymerized toner and production process thereof|
|US6544707||Jan 25, 2001||Apr 8, 2003||Fujitsu Limited||Two component developing agent and an image forming apparatus by use of the same|
|US6555281||Aug 2, 2000||Apr 29, 2003||Canon Kabushiki Kaisha||Toner, process for producing a toner, image forming method and image forming apparatus|
|US6569589||Jul 27, 2001||May 27, 2003||Canon Kabushiki Kaisha||Toner, toner production process and image forming method|
|US6586151||Oct 6, 2000||Jul 1, 2003||Canon Kabushiki Kaisha||Toner, process for producing toner image forming method and apparatus unit|
|US6589701||Jul 25, 2001||Jul 8, 2003||Canon Kabushiki Kaisha||Dry toner, image forming method and process cartridge|
|US6610454||Sep 3, 1998||Aug 26, 2003||Canon Kabushiki Kaisha||Toner and image forming method|
|US6623901||Dec 18, 1997||Sep 23, 2003||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US6627374||May 29, 2001||Sep 30, 2003||Canon Kabushiki Kaisha||Process and system for producing toner particles|
|US6632577||Aug 30, 1995||Oct 14, 2003||Canon Kabushiki Kaisha||Image forming method|
|US6635398||Oct 25, 2000||Oct 21, 2003||Canon Kabushiki Kaisha||Dry toner, dry toner production process, and image forming method|
|US6636717||Oct 15, 2001||Oct 21, 2003||Canon Kabushiki Kaisha||Developing device including first and second developer carrying devices with insufficiently-charged developer control feature|
|US6638674 *||Jul 25, 2001||Oct 28, 2003||Canon Kabushiki Kaisha||Magnetic toner|
|US6653037||Nov 19, 2001||Nov 25, 2003||Ricoh Company, Ltd.||Toner for developing latent electrostatic images, and image forming method and device|
|US6667140||Aug 31, 2001||Dec 23, 2003||Canon Kabushiki Kaisha||Toner and image forming method|
|US6670087||Nov 5, 2001||Dec 30, 2003||Canon Kabushiki Kaisha||Toner, image-forming apparatus, process cartridge and image forming method|
|US6671479||May 28, 2002||Dec 30, 2003||Xerox Corporation||Selective depopulation and/or repopulation of a full color image forming device|
|US6696211 *||Feb 21, 2001||Feb 24, 2004||Canon Kabushiki Kaisha||Developer, image-forming method, and process cartridge|
|US6696212||Mar 27, 2001||Feb 24, 2004||Heidelberger Druckmaschinen Ag||Single component toner for improved magnetic image character recognition|
|US6703175||Mar 20, 2002||Mar 9, 2004||Fuji Xerox Co., Ltd.||Color toner containing less conductive particles that have appropriate electrical resistance and can produce clear color images|
|US6703176 *||May 23, 2002||Mar 9, 2004||Canon Kabushiki Kaisha||Toner, process for producing toner image forming method and apparatus unit|
|US6706458||Oct 24, 2002||Mar 16, 2004||Canon Kabushiki Kaisha||Toner, process for producing a toner, image forming method and image forming apparatus|
|US6713221||Jan 11, 2002||Mar 30, 2004||Nof Corporation||Ester wax and toner using the wax|
|US6765077||Mar 10, 2003||Jul 20, 2004||Canon Kabushiki Kaisha||Negative-chargeability control resin|
|US6780368||Apr 10, 2001||Aug 24, 2004||Nanotek Instruments, Inc.||Layer manufacturing of a multi-material or multi-color 3-D object using electrostatic imaging and lamination|
|US6783910||Dec 12, 2002||Aug 31, 2004||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|US6797446||Dec 25, 2000||Sep 28, 2004||Samsung Electronics Co., Ltd.||Electrophotographic photoreceptors|
|US6808852||Sep 4, 2002||Oct 26, 2004||Canon Kabushiki Kaisha||Toner and heat-fixing method|
|US6808855||May 23, 2002||Oct 26, 2004||Canon Kabushiki Kaisha||Process for producing toner|
|US6819893||Apr 23, 2003||Nov 16, 2004||Ricoh Company, Ltd.||Image forming apparatus and charging device|
|US6838447||Mar 26, 2002||Jan 4, 2005||Linden Technologies, Inc.||Particulate compositions for chemical synthesis|
|US6852457||Nov 12, 2002||Feb 8, 2005||Fuji Xerox Co., Ltd.||Image fixing method|
|US6855471||Jan 13, 2003||Feb 15, 2005||Canon Kabushiki Kaisha||Toner and image-forming method|
|US6855501||Mar 26, 2002||Feb 15, 2005||Linden Technologies, Inc.||Transfer of arrayed chemical compositions|
|US6858364||Oct 10, 2003||Feb 22, 2005||Daewon Scn. Co., Ltd.||Electrophotographic photoreceptors|
|US6873816||Aug 16, 2002||Mar 29, 2005||Canon Kabushiki Kaisha||Developing assembly, process cartridge and image-forming method|
|US6924073 *||Dec 27, 2002||Aug 2, 2005||Ricoh Company, Ltd.||Toner for developing electrostatic latent image, toner cartridge, developer, developer cartridge, image forming method, and image forming apparatus|
|US6953648||Apr 24, 2003||Oct 11, 2005||Canon Kabushiki Kaisha||Process for producing toner particles|
|US6972166||Dec 23, 2003||Dec 6, 2005||Canon Kabushiki Kaisha||Toner, process for producing a toner, image forming method and image forming apparatus|
|US6982139||May 28, 2003||Jan 3, 2006||Fuji Xerox Co., Ltd||Electrophotographic color toner, and electrophotographic color developer, toner cartridge, image forming device and image forming method using the same|
|US6984479||Apr 24, 2002||Jan 10, 2006||Fuji Electric Imaging Device Co., Ltd.||Electrophotographic photoconductor and manufacturing method therefore|
|US7018764 *||Jun 19, 2003||Mar 28, 2006||Fuji Xerox Co., Ltd.||Toner for developing electrostatic images, process for preparing toner for developing electrostatic images, developer for developing electrostatic images and images forming method|
|US7018765 *||Apr 29, 2003||Mar 28, 2006||Konica Corporation||Toner particle having a hardnes of 6.0 to 24.0 mN and a circularity of 0.92 to 0.99|
|US7029813||Nov 21, 2003||Apr 18, 2006||Canon Kabushiki Kaisha||Toner|
|US7029816||Jun 21, 2004||Apr 18, 2006||Ricoh Company, Ltd.||Electrographic image formation method|
|US7045265||Oct 8, 2003||May 16, 2006||Fuji Xerox Co., Ltd.||Electrophotographic color toner|
|US7067608||Nov 25, 2003||Jun 27, 2006||Xerox Corporation||Process for preparing branched polyarylene ethers|
|US7074540 *||Nov 1, 2004||Jul 11, 2006||Fuji Xerox Co., Ltd.||Image forming apparatus|
|US7094514 *||Sep 12, 2003||Aug 22, 2006||Fuji Xerox Co., Ltd.||Image forming method|
|US7097952||May 10, 2005||Aug 29, 2006||Canon Kabushiki Kaisha||Toner, process for producing a toner, image forming method and image forming apparatus|
|US7118841 *||Apr 30, 2003||Oct 10, 2006||Zeon Corporation||Toner for developing an electrostatic image|
|US7122285 *||Mar 4, 2003||Oct 17, 2006||Konica Corporation||Toner for developing static latent image, method for producing toner for developing static latent image|
|US7135261||Aug 22, 2003||Nov 14, 2006||Fuji Electric Imaging Device Co., Ltd.||Multi-layered organic electrophotographic photoconductor|
|US7147981||Mar 26, 2004||Dec 12, 2006||Canon Kabushiki Kaisha||Toner|
|US7163775||Mar 19, 2004||Jan 16, 2007||Ricoh Company Limited||Toner for developing electrostatic image, method for manufacturing the toner, developer including the toner, container containing the toner, and color image forming method using the toner|
|US7166401||Mar 3, 2004||Jan 23, 2007||Fuji Xerox Co., Ltd.||Toner for electrophotography, image-forming method, image-forming apparatus and toner cartridge|
|US7169522 *||Mar 12, 2003||Jan 30, 2007||Ricoh Company, Ltd.||Toner for developing a latent electrostatic image, developer using the same, full-color toner kit using the same, image-forming apparatus using the same, image-forming process cartridge using the same and image-forming process using the same|
|US7208255||Apr 22, 2004||Apr 24, 2007||Dpi Solutions, Incorporated||Powder-coated toner particles and method of making same|
|US7208256||Mar 18, 2004||Apr 24, 2007||Ricoh Company, Ltd.||Toner for image formation, method of producing the toner, toner container, toner cartridge, process cartridge, and image forming apparatus|
|US7217334 *||Sep 3, 2004||May 15, 2007||Seiko Epson Corporation||Method for forming film, method for forming wiring pattern, method for manufacturing semiconductor device, electro-optical device, and electronic device|
|US7247228||Jun 14, 2004||Jul 24, 2007||Eastman Kodak Company||Method for preparing a carrier for a photoconductor for the formation of an electrophotographic recording element and a recording element formed accordingly|
|US7277196 *||Jan 15, 2003||Oct 2, 2007||Xerox Corporation||Iterative printer control and color balancing system and method using a high quantization resolution halftone array to achieve improved image quality with reduced processing overhead|
|US7294442||Oct 27, 2006||Nov 13, 2007||Ricoh Company. Ltd.||Toner for developing electrostatic image, method for manufacturing the toner, developer including the toner, container containing the toner, and color image forming method using the toner|
|US7316882||Sep 30, 2002||Jan 8, 2008||Fuji Xerox Co., Ltd.||Image forming method|
|US7371495||Mar 15, 2005||May 13, 2008||Kabushiki Kaisha Toshiba||Toner|
|US7378206||Jan 12, 2004||May 27, 2008||Lg Chem, Ltd.||Non-magnetic monocomponent positive toner composition having superior transfer efficiency|
|US7386256 *||Dec 9, 2004||Jun 10, 2008||Ricoh Company, Ltd.||Toner, developer, toner container and latent electrostatic image carrier, and process cartridge, image forming method, and image forming apparatus using the same|
|US7396895||Nov 25, 2003||Jul 8, 2008||Xerox Corporation||Branched polyarylene ethers and processes for the preparation thereof|
|US7399566||Jan 18, 2005||Jul 15, 2008||Milliken & Company||Color toner and developer compositions and processes for making and using such compositions|
|US7403728||Jul 13, 2005||Jul 22, 2008||Xerox Corporation||Calibration apparatus and method for charging unit of image forming device|
|US7410742 *||Nov 5, 2004||Aug 12, 2008||Konica Minolta Business Technologies, Inc.||Image forming method|
|US7420169||Sep 27, 2005||Sep 2, 2008||Xerox Corporation||Dicorotron wire assembly removal-insertion tool|
|US7426312 *||Jul 5, 2005||Sep 16, 2008||Xerox Corporation||Contrast enhancement of images|
|US7459255||Sep 16, 2005||Dec 2, 2008||Ricoh Company, Ltd.||Toner and developer, toner container, process cartridge, image-forming apparatus, and image-forming method using the same|
|US7471418||Jun 2, 2005||Dec 30, 2008||Xerox Corporation||Image/document analysis tool and method for multi-station image forming device|
|US7482104||Apr 16, 2008||Jan 27, 2009||Ricoh Company, Ltd.||Toner, developer, toner container and latent electrostatic image carrier, and process cartridge, image forming method, and image forming apparatus using the same|
|US7518376||Feb 16, 2007||Apr 14, 2009||Xerox Corporation||Electric field probe|
|US7537875||Jun 22, 2005||May 26, 2009||Canon Kabushiki Kaisha||Toner|
|US7550245||Dec 22, 2005||Jun 23, 2009||Ricoh Company, Ltd.||Toner and production method of the same, and image forming method|
|US7572564 *||Apr 12, 2006||Aug 11, 2009||Fuji Xerox Co., Ltd.||Toner for electrostatic image development, electrostatic image developer and image forming method using the same|
|US7588874||Aug 12, 2004||Sep 15, 2009||Fuji Xerox Co., Ltd.||Toner for developing electrostatic image used in electrophotography and process for producing the same|
|US7611815 *||Jul 15, 2003||Nov 3, 2009||Ricoh Company, Ltd.||External additive for toner for electrophotography, toner for electrophotography, double-component developer for electrophotography, image-forming process using the toner, and image-forming apparatus using the toner|
|US7634222||Aug 8, 2006||Dec 15, 2009||Xerox Corporation||Oil dispenser for simplex and duplex print engine|
|US7662529||Sep 13, 2006||Feb 16, 2010||Fuji Electric Device Technology Co., Ltd.||Electrophotographic photoconductor|
|US7687216||Jun 17, 2005||Mar 30, 2010||Sharp Kabushiki Kaisha||Two-component developer and two-component developing apparatus using the same|
|US7693458||Jun 8, 2007||Apr 6, 2010||Ricoh Company, Ltd.||Charging device, process cartridge, and image forming apparatus|
|US7704654||Feb 9, 2005||Apr 27, 2010||Konica Minolta Business Technologies, Inc.||Image forming method|
|US7723000||Dec 20, 2006||May 25, 2010||Fuji Electric Device Technology Co., Ltd.||Electrophotographic photoconductor|
|US7740998||Feb 16, 2006||Jun 22, 2010||Canon Kabushiki Kaisha||Positively chargeable developer|
|US7756442||Sep 18, 2006||Jul 13, 2010||Xerox Corporation||Locking feature for use in cartridge insertion guide applications|
|US7804510||Jul 18, 2006||Sep 28, 2010||Xerox Corporation||Imaging method for universal printers using an image-on-image process|
|US7811729||Dec 11, 2008||Oct 12, 2010||Xerox Corporation||Imaging member|
|US7811730||Dec 11, 2008||Oct 12, 2010||Xerox Corporation||Imaging member|
|US7838192||Apr 24, 2007||Nov 23, 2010||Xerox Corporation||Methods for making customized black toners|
|US7862970||May 13, 2005||Jan 4, 2011||Xerox Corporation||Toner compositions with amino-containing polymers as surface additives|
|US7897316||Jul 24, 2006||Mar 1, 2011||Canon Kabushiki Kaisha||Toner having hybrid binder resin with polyester unit and vinyl copolymer unit|
|US7923190 *||Oct 13, 2009||Apr 12, 2011||Canon Kabushiki Kaisha||Toner|
|US7943276||Dec 11, 2008||May 17, 2011||Xerox Corporation||Imaging member|
|US7943279||Mar 11, 2009||May 17, 2011||Konica Minolta Business Technologies, Inc.||Copper complex compound and electrophotographic toner containing the same|
|US7985523||Dec 18, 2008||Jul 26, 2011||Xerox Corporation||Toners containing polyhedral oligomeric silsesquioxanes|
|US8007978||Feb 28, 2007||Aug 30, 2011||Dow Global Technologies Llc||Aqueous dispersions for use as toners|
|US8015724 *||Apr 19, 2005||Sep 13, 2011||Panasonic Electric Works Co., Ltd.||Heating blower with electrostatic atomizing device|
|US8026030||Nov 3, 2006||Sep 27, 2011||Canon Kabushiki Kaisha||Toner|
|US8032061 *||Jul 3, 2007||Oct 4, 2011||Samsung Electronics Co., Ltd||Electrophotographic image forming apparatus having transparent toner and white toner|
|US8057974||Dec 11, 2008||Nov 15, 2011||Xerox Corporation||Imaging member|
|US8084177||Dec 18, 2008||Dec 27, 2011||Xerox Corporation||Toners containing polyhedral oligomeric silsesquioxanes|
|US8182598 *||Feb 22, 2005||May 22, 2012||Clariant Produkte (Deutschland) Gmbh||Violet colorant for colour filters, inks for ink-jet electrophotographic toners and developers and e-inks|
|US8232035||Aug 26, 2010||Jul 31, 2012||Xerox Corporation||Methods for making customized black toners|
|US8236472||Nov 24, 2009||Aug 7, 2012||Konica Minolta Business Technologies, Inc.||Image forming method|
|US8252502||Sep 12, 2007||Aug 28, 2012||Ricoh Company, Ltd.||Method for producing toner and resulting toner|
|US8309289||Mar 19, 2010||Nov 13, 2012||Fuji Xerox Co., Ltd.||Electrostatic charge image developing toner, electrostratic charge image developer, toner cartridge, process cartridge, and image forming apparatus|
|US8329368||Mar 11, 2009||Dec 11, 2012||Konica Minolta Business Technologies, Inc.||Electrophotographic toner|
|US8329812||Jul 27, 2011||Dec 11, 2012||Dow Global Technologies Llc||Aqueous dispersions for use as toners|
|US8349531||Nov 26, 2008||Jan 8, 2013||Dow Global Technologies Llc||Compounds and methods of forming compounds useful as a toner|
|US8488994||Sep 23, 2011||Jul 16, 2013||Stratasys, Inc.||Electrophotography-based additive manufacturing system with transfer-medium service loops|
|US20090311618 *||Jun 15, 2009||Dec 17, 2009||Chang-Soon Lee||Surface-modified non-magnetic mono-component color toner with improvements in background contamination and transfer efficiency and method of preparing the same|
|US20110151372 *||Dec 7, 2010||Jun 23, 2011||Masaki Watanabe||Toner, image forming method using the toner, and image forming apparatus using the toner|
|US20110217651 *||Feb 28, 2011||Sep 8, 2011||Konica Minolta Business Technologies, Inc.||Image formation method and image formation apparatus|
|US20120295189 *||Jul 8, 2011||Nov 22, 2012||Hubei Dinglong Chemical Co., Ltd.||Bicomponent developing agent|
|USRE29357 *||Jun 29, 1972||Aug 16, 1977||Xerox Corporation||Image formation and development|
|USRE38026||Sep 27, 2001||Mar 11, 2003||Canon Kabushiki Kaisha||Developing device having regulating rotary member for regulating toner amount|
|DE974162C *||Aug 31, 1955||Sep 29, 1960||Rca Corp||Verfahren zur Herstellung von lithographischen Druckplatten nach dem elektrostatischen Verfahren|
|DE1117391B *||Mar 18, 1959||Nov 16, 1961||Kalle Ag||Elektrophotographisches Verfahren zur Herstellung von Druckformen|
|DE1131707B *||Apr 23, 1958||Jun 20, 1962||Rank Xerox Ltd||Elektrostatisches Verfahren zum UEbertragen isolierender Teilchen auf eine leitende Flaeche bei der Herstellung von xerographischen Reproduktionen|
|DE1153769B *||Oct 22, 1959||Sep 5, 1963||Wilhelm Ritzerfeld||Verfahren zur Erzeugung, zur Erneuerung und zum Abdruck von xerographisch hergestellten hektographischen Druckformen|
|DE1158987B *||Dec 17, 1958||Dec 12, 1963||Commw Of Australia||Verfahren zum Herstellen einer Flach-Druckform oder einer AEtzreservage von einem latenten elektrostatischen Bild|
|DE1187123B *||Nov 26, 1959||Feb 11, 1965||Rank Xerox Ltd||Xerographischer Reproduktionsapparat|
|DE1193515B *||Sep 1, 1961||May 26, 1965||Rca Corp||Xerographisches Verfahren zur Herstellung einer geaetzten Druck- oder Schaltungsplatte|
|DE1216692B *||Sep 21, 1964||May 12, 1966||Dick Co Ab||Elektrophotographisches Kopierverfahren und Vorrichtung zur Durchfuehrung des Verfahrens|
|DE1271548B *||May 10, 1960||Jun 27, 1968||Zeiss Ikon Ag||Elektrophotographisches Verfahren|
|DE1797619B1 *||Jun 29, 1967||Nov 24, 1977||Xerox Corp||Elektrophoretophotographisches abbildungsverfahren|
|DE1797620B1 *||Jun 29, 1967||Nov 10, 1977||Xerox Corp||Elektrophoretophotographisches abbildungsverfahren|
|DE1797635B1 *||Jun 29, 1967||Nov 10, 1977||Xerox Corp||Elektrophoretophotographisches abbildungsverfahren|
|DE2032652A1 *||Jul 1, 1970||Jan 14, 1971|| ||Title not available|
|DE2132017A1 *||Jun 28, 1971||Feb 10, 1972||Xerox Corp||Elektrofotografisches Kopierpapier|
|DE2733187A1 *||Jul 22, 1977||Jan 26, 1978||Ricoh Kk||Photoempfindliches material auf selenbasis fuer die elektrophotographie|
|DE2803618A1 *||Jan 27, 1978||Aug 3, 1978||Canon Kk||Verfahren und einrichtung zur entwicklung elektrostatischer ladungsbilder|
|DE2911290A1 *||Mar 22, 1979||Nov 22, 1979||Xerox Corp||Ein feststehender heftmaschinenkopf|
|DE2920291A1 *||May 18, 1979||Apr 10, 1980||Xerox Corp||Bandspannsystem|
|DE2950483A1 *||Dec 14, 1979||Jun 19, 1981||Siemens Ag||Verfahren zur feststellung von beschichtungsfehlern von fotoleitertrommeln fuer elektrofotographische kopierverfahren|
|DE3008881A1 *||Mar 7, 1980||Sep 18, 1980||Canon Kk||Entwicklungsverfahren|
|DE3111558A1 *||Mar 24, 1981||Feb 4, 1982||Canon Kk||Verfahren und vorrichtung zum erzeugen und aufzeichnen zusammengesetzter bilder|
|DE3111558C2 *||Mar 24, 1981||Jan 5, 1989||Canon K.K., Tokio/Tokyo, Jp||Title not available|
|DE3117210A1 *||Apr 30, 1981||Feb 18, 1982||Tokyo Shibaura Electric Co||Uebertragungseinrichtung|
|DE3546817C2 *||Apr 24, 1985||May 23, 1996||Canon Kk||Binder resin for toner useful in electrophotography etc.|
|DE102012205386A1||Apr 3, 2012||Oct 11, 2012||Xerox Corporation||Verfahren zum Herstellen eines Toners|
|DE112009000593T5||Mar 12, 2009||Feb 10, 2011||Park & Opc Co., Ltd.||Elektrostatischer Bildentwicklungstoner|
|EP0201923A2 *||May 14, 1986||Nov 20, 1986||Lichtenberg & Co Chemische Fabrik Zweigniederlassung der UK-Mineralölwerke Wenzel & Weidmann GmbH, Eschweiler||Method for coating solid bodies with lubricants|
|EP0466149A1||Jul 11, 1991||Jan 15, 1992||Canon Kabushiki Kaisha||Toner, developer, and image forming method|
|EP0541113A1||Nov 6, 1992||May 12, 1993||Canon Kabushiki Kaisha||Monocomponent-type developer for developing electrostatic image and image forming method|
|EP0658819A2||Nov 29, 1994||Jun 21, 1995||Canon Kabushiki Kaisha||Toner and developer for developing electrostatic image, process for production thereof and image forming method|
|EP0683436A1||May 16, 1995||Nov 22, 1995||Minnesota Mining And Manufacturing Company||Liquid toners utilizing highly fluorinated solvents|
|EP0686882A1||May 12, 1995||Dec 13, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic images, process cartridge, and image forming method|
|EP0686885A1||May 31, 1995||Dec 13, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic images|
|EP0687960A1||Jun 13, 1995||Dec 20, 1995||Canon Kabushiki Kaisha||Toner for developing electrostatic images and image forming method|
|EP0692749A2||Jul 11, 1995||Jan 17, 1996||Hitachi, Ltd.||Electrophotographic copying apparatus|
|EP0699963A1||Aug 4, 1995||Mar 6, 1996||Canon Kabushiki Kaisha||Magnetic toner and image forming method|
|EP0707239A1||Sep 20, 1995||Apr 17, 1996||Canon Kabushiki Kaisha||Toner for developing electronstatic images, image forming method and process cartridge|
|EP0708376A2||Sep 29, 1995||Apr 24, 1996||Canon Kabushiki Kaisha||Two-component type developer, developing method and image forming method|
|EP0708378A2||Sep 29, 1995||Apr 24, 1996||Canon Kabushiki Kaisha||Two-component type developer, developing method and image forming method|
|EP0713153A2||Nov 7, 1995||May 22, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic images, two component type developer, developing method, image forming method, heat fixing method, and process for producing toner|
|EP0715216A1||Nov 23, 1995||Jun 5, 1996||Fuji Electric Co., Ltd.||Titanyloxyphthalocyanine crystals, methods for preparing the same, and electrophotographic photoreceptors using such crystals|
|EP0716351A2||Nov 27, 1995||Jun 12, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|EP0718703A2||Dec 18, 1995||Jun 26, 1996||Canon Kabushiki Kaisha||Toner for developing electrostatic image|
|EP0772093A1||Oct 29, 1996||May 7, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image, process-cartridge and image forming method|
|EP0774695A1||Nov 19, 1996||May 21, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic images|
|EP0774696A2||Nov 19, 1996||May 21, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image, image forming method and process-cartridge|
|EP0784237A2||Jan 9, 1997||Jul 16, 1997||Canon Kabushiki Kaisha||Toner for developing electrostatic image, apparatus unit and image forming method|
|EP1209531A1||Nov 22, 2001||May 29, 2002||Xerox Corporation||Toner compositions comprising vinyl resin and poly (3,4-ethylenedioxythiophene)|
|EP1441504A2 *||Jan 14, 2004||Jul 28, 2004||Xerox Corporation||Color balancing system and method using a high quantization resolution halftone array|
|EP1677159A2||Dec 27, 2005||Jul 5, 2006||Ricoh Company Ltd.||Toner, method for its production and image forming method|
|EP1959264A1||Feb 12, 2008||Aug 20, 2008||Xerox Corporation||Electric field probe|
|EP2100896A1||Mar 9, 2009||Sep 16, 2009||Konica Minolta Business Technologies, INC.||Copper complex compound and electrophotographic toner containing the same|
|EP2101222A1||Mar 9, 2009||Sep 16, 2009||Konica Minolta Business Technologies, INC.||Electrophotographic toner|
|EP2296043A1||Mar 23, 2010||Mar 16, 2011||Fuji Xerox Co., Ltd.||Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus|
|EP2399752A2||May 31, 2011||Dec 28, 2011||Eastman Kodak Company||Thermal receiver elements and imaging assemblies|
|WO2010151293A1||Jun 16, 2010||Dec 29, 2010||Eastman Kodak Company||Extruded image receiver elements|
|WO2011019180A2||Aug 10, 2010||Feb 17, 2011||Park & Opc Co., Ltd.||Electrostatic image-developing toner|
|WO2011028230A1||Aug 12, 2010||Mar 10, 2011||Eastman Kodak Company||Image receiver elements|
|WO2011123426A1||Mar 29, 2011||Oct 6, 2011||Eastman Kodak Company||Image receiver elements with overcoat|
|WO2013016149A1||Jul 20, 2012||Jan 31, 2013||Cabot Corporation||High resistivity coating compositions having unique percolation behavior, and electrostatic image developing systems and components thereof incorporating same|
| || |
|U.S. Classification||430/55, 439/85, 430/42.1, 101/467, 430/31, 347/140, 430/56, 430/300, 399/314, 347/137, 347/131, 430/49.1, 361/225, 358/300, 101/DIG.370, 430/124.1, 430/302, 430/97, 219/216, 430/5, 430/6, 430/125.32, 430/120.1|
|International Classification||G03G9/08, G03G15/26, G03G5/082|
|Cooperative Classification||G03G5/08207, G03G15/266, Y10S101/37, G03G9/08|
|European Classification||G03G15/26C, G03G9/08, G03G5/082B|