|Publication number||US3744216 A|
|Publication date||Jul 10, 1973|
|Filing date||Aug 7, 1970|
|Priority date||Aug 7, 1970|
|Publication number||US 3744216 A, US 3744216A, US-A-3744216, US3744216 A, US3744216A|
|Original Assignee||Environmental Technology|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Non-Patent Citations (2), Referenced by (176), Classifications (26)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1191 Halloran 111 3,744,216 1451 July 10, 1973 Pabst et al. 55/234 AIR PURIFIER 2,927,659 3/1960 2,948,353 8/1960 Penney 55/139 X [751 Invent Baum", Rwy", 2,950,387 8/1960 Brubaker 250/419 'IF  Assignee: Environmental Technology 2; et
- Cmlmmmn Newmwn 3,271,932 9/1966 Newell 55/138 x  Filed: Aug. 7, 1970 3,520,172 7/1970 L111 et a1. 73/28 211 App} 2,121 FOREIGN PATENTS OR APPLICATIONS 1,115,812 l/l956 France 55/123 1 550112121114 R. 21/9111 2, 3321332 341323 E12;111181;;11:11::1311111311111111iiii 55/107, 55/122, 55/123, 55/126, 55 /132, 55/134, 55/138, 55/139, 55/155, 55/234, OTHER PUBLICATIONS 55/279, 55/315, 55/486, 55/521, 55/524, Emanuel, A.G., Potassium Permanganate Offers New 55/528, 250/42 Solutions to Air Pollution Control," Reprinted from  Int. Cl. B03c 3/38 Air Engineering, September 1965, received in Patent  Field of Search 55/2, 5, 6, 7, 8, Office April 25, 1966 (2 pages) 55/10, 101 102, 107, 122, 123, 124, 126, Posselt et a1. Odor Abatement With Potassium Per- 128, 129, 130, 131, 132, 134, 136, 138, 139, manganate Solutions Reprinted from [EEC Product 140, 141, 142, 146, 154, 155, 279, 234, 524, Research and Development, Vol. 4, No. 1, March 1965 315, 316, 486, 521, 527, 528; 21/53, 54, 55, pages 48-50, received in Patent Office April 25, 1966 58, 74, 77, DIG. 2; 250/42; 204/312, 313,
316, 318, 319 Primary Examiner-Dennis E. Talbert, Jr. AttrneySeidel, Gonda & Goldhammer  References Cited UNITED STATES PATENTS V B RA 2,085,758 7/1937 Krutzsch 55/2 An air Purifier is Provided for P y g air in rooms of 2,086,063 7/1937 Bn'on et a1 a home, office, or other commercial establishment. Air 2,297,601 9/1942 Williams is filtered by a mechanical filter, then odors are re- 2,307,602 1/1943 Penney et a1 moved from the air, and the air is exposed to germicidal 3 9/ 1944 skfnnef lamps for killing bacteria, then the air passes through 217151056 8/1955, wllsn a high efficiency electrostatically enhanced filter, and
58:21: then it is returned to the room by blowers. 219171130 12/1959 Powers ..-55 132 8 Claims, 3 Drawing Figures 2a [r imH .".-i 32 .30 Fig 22% 1 1 g, 1 54 g 64 62 1 5a i I 66/ l 72 60 68 1 1 a Pmmen m 3.744.216
/0 /24 T-z f l gi/ nvvslvrolr JOHNJ.HALLORA/V 68 22 v ATTORNEVS AIR PURIFIER Air contamination is generally broken down into two separate and distinct areas. The first area concerns itself with particulate contamination of the air and consists of particles of airborne lint, fly ash, dust, pollen, fungus spores, bacteria, and minute liquid aerosols. The second area concerns itself with gaseous contaminates such as carbon monoxide, sulfur dioxide, etc. which are in solution with the air molecules. Each of these contaminations is present to a certain extent within the home and commercial establishments.
in the home, contaminants include aerosols of cooking fat and food particles, asbestos from floor tiles and wallboard material, aerosol spray disinfectants, cleaners, insecticides, and many other contaminants. Airborne and condensed tars and nicotine from tobacco smoke present such a pollution hazard in a building as do automobile exhausts to the outside environment. In addition, unpleasant contaminants such as body odor, dandruff, cooking odors, etc. are present within a home.
In accordance with the present invention, the effective removal of pollutants is best accomplished by attacking separately the two areas of pollution referred to above, that is, particulate and gaseous. Simple filtration will remove many airborne particulates but their efficiency and the minimum size particle removed have been limited. Ordinary dust and lint are of various sizes down to 10 microns. These size particles can be removed with good filtration practices.
Many particles in the atmosphere which are'undesirable and harmful are smaller than 10 microns. Fly ash and some dusts have a particle size of 0.5 microns. Pollen has a size on the order of 5 microns. Fungus spores and bacteria range from 0.3 to microns. These particles are not removed by ordinary filter materials.
Heretofore, the filtration of ultrafine particles of a size less than 10 microns were filtered by either high voltage electrostatic precipitation or by high efficiency mechanical entrainment filter systems having a tortuous path.
Filtration of odors heretofore has been generally accomplished by absorbing small quantities of gaseous contaminants on a materail such as activated charcoal. As concentrations increase over short periods of time, or if the activated charcoal absorbs gases and then experiences a significant temperature or humidity change, the charcoal will desorb. This desorption results in the readmission of such gases as carbon monoxide and sulfur dioxide as well as the odor molecules. In addition to requiring extreme care in application and maintenance in order to be effective, activated charcoal is limited in its effectiveness by several serious air pollution ingredients such as hydrogen sulfide, methane, and some unburned hydrocarbons.
In accordance with the present invention, gaseous contamination is removed by the use of an odor oxident. The odor oxident oxidizes the gaseous contaminants so as to completely destroy their nature and convert them into a secondary inert chemical substance. There is no tendency whatsoever to desorb and re-emit the odor particles.
Viruses are considerably smaller than bacteria and fungus spores. Neither electrostatic precipitators nor particulate entrainment cells have proven to be capable of destroying viruses. In accordance with the present invention, the purifier is provided with a germicidal ultraviolet lamp which irradiates the air passing through the purifier to kill bacteria, fungus spores, viruses, etc.
After the air has passed through a roughing filter, the
odors may be removed by an oxident, and the air may then be subjected to the action of the germicidal lamp. The air is subjected to a high efficiency filter. The high efficiency filter is alternately charged with opposite voltage levels to enhance the passive filtration by increasing the path length of charged particulates. The otherwise straight line flow path of particulates is changed to a zig-zag pattern so that they collide with the filter media many times. The path length of micron and submicron sized particles can be increased by a factor of 10 to using relatively low voltages. The low voltages involved in the present invention, such as 100 to volts, are to be compared with the 20,000 volts utilized in electrostatic precipitators. The inherent advantages of using a low voltage system will be readily apparent from the viewpoint of cost, safety to personnel, and the manner in which the voltages perform their respective functions.
It is an object of the present invention to provide a novel air purifier.
It is another object of the present invention to provide an efficient, compact, relatively inexpensive air purifier. I
It is an object of the present invention to provide an air purifier which will remove particulates as well as gaseous contaminants in a manner which is more efficient and effective than systems proposed heretofore.
It is another object of the present invention to provide a home air purifier which will remove particulates and gaseous contaminants in a highly efficient manner, with efficiency being approximately 99.9 percent for contaminants having a size of at least 0.3 microns.
For the purpose of illustrating the invention, there is shown in the drawings a form which is presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown.
FIG. 1 is a vertical sectional view of an air purifier in accordance with the present invention.
FIG. 2 is a sectional view taken along the line 22 in FIG. 1.
FIG. 3 is a schematic wiring diagram for the low voltage power supply.
Referring to the drawing in detail, wherein like numerals indicate like elements, there is shown in FIG. 1 an air purifier in accordance with the present invention designated generally as 10. The air purifier 10 includes a housing having a front wall 12, a back wall 14, side walls 16 and 18, a top wall 20, and a bottom wall 22. While the housing is preferably rectangular, other configurations may be utilized.
The inlet to the air purifier 10 is through the top wall. The top wall 20 is provided with a depending flange 24 defining an opening within which is mounted an intake grille 26. Below the grille 26, there is supported in any convenient manner a roughing filter 28 which constitutes a first filter means for the air. The roughing filter 28 removes large particles having a size of approximately 20 microns or more. When deoxidation is desired, there is provided a second filter means in the form of a wetted screen 30. The screen 30 may include a close knit fabric layer such as cotton cheesecloth or polyester wool connected by a wick 32 to a source of an oxidixing agent within container 34.
The container 34 is supported on a shelf in chamber 36. Chamber 36 is defined by wall panel 38 and side wall 18. An entrance door or panel for providing access to chamber 36 is provided but not shown. The oxidizing agent in container 34 may be any one of a variety of inorganic compounds in solution with water. Notable among these oxidizing agents are the salts of permanganate, dichromate, nitrate, and peroxide. These compounds form negative ions in solution which will oxidize almost all organic and inorganic compounds. Oxidation will, in may cases, break compounds down to simpler forms changing odorful constituents to carbon dioxide, water, and various other odorless compounds.
The second filter means removes the gaseous or odorous contaminants from the air stream. This is accomplished by capillary action wherein the wick 32 feeds the oxidizing agent to the wetted screen 30. The wick 32 is preferably wrapped about a negatively charged electrode. This promotes the evaporation of droplets from the wetted screen 30 with a net negative charge by driving negative ions to the surface where the thermodynamic evaporation takes place. This introduces negatively charged droplets into the stream. If particles of positive charge are present in the air stream, they will be attracted to the negative droplets for reaction. Particles are known to carry odorproducing gases. One of the common problems with highly efficient particle entrapment is that trapped particles outgas odorful gases. In the present invention, the absorbed gases will oxidize.
The oxidation may be enhanced by heat from an ultraviolet source such as the germicidal lamps 40 and 42. The germicidal lamps 40 and 42 are conveniently supported by wall 16 and panel 38 below the wetted screen 30. The germicial lamps are provided with shields so as to direct the ultraviolet rays towards each other. The negative charge associated with the wetted screen 30 will cause electrons to be emitted when struck by the ultraviolet rays from the lamps 40 and 42. The electrons will strike particles in the air stream knocking off outer shell electrons and giving the struck particles a net positive charge. Thus, the ultraviolet ray sources serve as an ionizer. In addition, the lamps 40 and 42 may be provided when it is desired to destory bacteria, viruses, fungus spores, etc., which are present as contaminants in the air stream.
The next stage of the air purifier of the present invention is disposed below thelamps 40 and 42. The next stage namely the third filter means, is comprised of a high efficiency particulate air filter in the form of a pleated filter member 44. Non-charged particles will enter the filter member 44 and be trapped therein with the usual efficiency of the medium. However, charged particles even with one electron missing, will be trapped with a greater efficiency. This is accomplished by an electrostatic field which causes the charged particles to travel in a zig-zag path through the filter member 44. The increased path length causes the particles to make many more encounters or impacts with the filter member 44.
The filter member 44 is preferably a high efficiency air filter media such as DEXIGLAS sold commercially. Said air filter media may be manufactured by laminating two or more separate and distinct media together forming a multiply filter. The plies of the filter are constructed entirely of synthetic fibers chemically bonded together with a moisture-resistant, fire-retarding bonding agent and coated with a mildew inhibitor. Tough filter media with temperate resistance up to 300C may be microglass or microglass and cellulosic fibers treated with plastic resins. Said air filter member 44 does not interfere with the ability of the air to flow through the air purifier 10 of the present invention with substantially laminar flow and a maximum pressure drop of 0.3-in'ches of water.
The pleated filter member 44 is supported between charged electrode plates 46 and 48 electrically insulated from the housing and coupled to a power supply 50 by conductors 56 and 54, respectively. The filter member 44 and the plates are part of a subassembly installed as a unit with non-conductive walls 47 and 49. The plates 46 and 48 are the end walls of a topless, bottomless unit. If desired, plates 46 and 48 may be the side walls of the unit if the filter member 44 is rotated 90 from the position shown. Hence, plates 46 and 48 may be positioned to be parallel to walls 12 and 14, if desired. The power supply 50 isdisposed within chamber 52. Chamber 52 is likewise defined by the side wall 18 and wall panel 38 so as to be below chamber 36. Suitable door means is provided to facilitate access to chamber 52.
One or more blowers are provided to create an air stream through the air purifier l0 and return the air stream to the room surrounding the purifier 10. As shown more clearly in FIG. 1, there is provided a pair of blowers. The first blower 58 has a motor 60 at its bottom and an air intake at its upper end. The outlet of the blower 58 is connected to an outlet conduit 62 aligned with a grille 64 in side wall 16.
A blower 66 has a motor 68 and an intake at its upper end. The outlet of blower 66 is connected to an outlet conduit 70 aligned with an outlet grille 72 in side wall 18. Suitable controls such as an on-off switch, speed control, and pilot light may be provided on the housing wherever desired. As illustrated in FIG. 2, the controls 74 are provided on the front wall 12. An electrical distribution block 76 may be provided within the housing and connected to a source of potential by electrical cord 80. The distribution box 76 is coupled to the motors 60 and 68 as well as the power supply 50 by conductors, not shown.
In FIG. 3, there is illustrated a schematic diagram of the power supply 50 which is a multi-vibrator network for generating a square wave potential applied to plates 46 and 48. The power supply includes a full wave bridge rectifier 82 and multi-vibrator 83 whose output is coupled to conductors 54 and 56. A capacitor 86, such as a two microfarad capacitor, is coupled across the conductors 84 and 86. A resistor 88, such as a 100K ohm resistor, is connected in series with a neon tube across the conductors 84 and 86. A similar resistor 92 is connected in series with a similar neon tube 94 across conductors 84 and 86.
A capacitor 96 such as 0.3uf is coupled across the junction 98 and 99 as shown more clearly in FIG. 3. The conductor 56 is coupled to junction 99. Those skilled in the art should recognize that multi-vibrator circuit 83 generates a square wave such as illustrated just below conductor 54. Submicron particles are influenced most by the small voltages applied to the plates 46 and 48 such as 100 to volts. The square wave signal applied to the plates at a frequency of about 8 cycles per second causes particles of 0.05 micron size travelling at the rate of 200 fpm to make at least seven encounters with the filter member 44.
The velocity of the air stream is in the range of 100 to 500 fpm with the frequency of the square wave signal varying from 4 to 20 cps in accordance with a straight line graph of velocity versus frequency.-
In view of the above description, a detailed description of operation is not deemed necessary. Air from a room is sucked in through the intake grille 26 and returned to the room through the grilles 64 and 72 by means of the blowers 68 and 66. The air flow is essentially laminar and indicated diagrammatically by the arrows in FIG. 1. The air sequentially is subjected to a roughing filter, an oxidation process for odor removal, ultraviolet rays, and then passes through a high efficiency filter. The air returned to the room by way of the grilles 72 and 64 is free of odors, bacteria, viruses, and particulates greater than 0.3 microns.
The air purifier may be utilized in industrial applica tions, for hospital applications wherein health of a patient requires a purified atmosphere, as well as in the home as a supplement to air conditioning systems which essentially cool the air and remove only gross particulates. The air purifier is a compact integrated unit which in order to use merely requires that the plug on cord 80 be plugged into the conventional household electrical circuit. As soon as the on switch of control 74 is turned, the blowers will start, the power supply 50 will be connected to the source of potential and the lamps 40 and 42 will be turned on. Periodically, it will be necessary to check the level of the oxidizing agent in container 34 and refill the same. Otherwise, the air purifier 10 requires little or no maintenance, except for replacement of elements 28 and 44 as needed.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, reference should be made to the appended claims, rather than to the foregoing specification as indicating the scope of the invention.
1. An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said.housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said lastmentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxidizing means including an air-permeable substrate, and an ultraviolet lamp means for sequentially treating air at a location in the housing between said two filter means.
2. An air purifier in accordance with claim 1 including a pair of oppositely disposed germicidal lamps facing towards each other and positioned between said two filter means.
3. An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said lastmentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, an odor oxidizing means having a substrate connected to a source of an oxidizing agent, and said substrate being disposed between said two filter means.
4. An air purifier in accordance with claim 3 wherein said housing includes a chamber, a container for an oxidizing agent within said chamber, and wick means connecting said substrate to said container.
5. An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, two filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the filter member, said lastmentioned means including spaced electrode plates coupled to a power supply, said filter member being disposed between said plates, said last-mentioned means including a rectifier multi-vibrator circuit for producing a square wave signal at said spaced electroplates between which said filter member is disposed.
6. An air purifier in accordance with claim 5 wherein said circuit is an AC circuit with a square wave signal frequency of about 4 to 20 cycles per second.
7. An air purifier comprising a housing containing an inlet and an outlet, blower means for causing air to flow through the housing from the inlet to the outlet, filter means in series in said housing between said inlet and outlet for filtering the air flowing between the inlet and outlet, one of said filter means being a pleated filter member, means defining a low voltage electrostatic field in said housing for causing particles to travel in a zig-zag path through the pleated filter member, said last-mentioned means including spaced electrode plates coupled to a power supply, said pleated filter member being disposed between said plates, oxidizing means upstream from said one filter means for chemically oxidizing odors, said odor oxidizing means including a substrate through which air can flow, a source of an oxidizing agent, and wick means connecting said substrate to said source of oxidizing agent.
8. An air purifier in accordance with claim 7 wherein said power supply includes a rectifier multi-vibrator circuit for producing a square wave signal at spaced electrode plates between said pleated filter member is disposed, said circuit being an AC circuit, and the square wave signal having a frequency of about 4 to 20 cycles per second.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2085758 *||Jun 7, 1932||Jul 6, 1937||Internat Precipitation Co||Process and means for production of surface ionization in insulator bodies|
|US2086063 *||Nov 30, 1931||Jul 6, 1937||Internat Precipitation Co||Arrangement for the electric cleaning of gases|
|US2297601 *||Sep 3, 1940||Sep 29, 1942||American Air Filter Co||Electric gas cleaner|
|US2307602 *||Oct 20, 1938||Jan 5, 1943||Westinghouse Electric & Mfg Co||Electrostatic dust sampler|
|US2359057 *||Feb 28, 1942||Sep 26, 1944||Donald Skinner George||Heating and ventilating system|
|US2715056 *||Dec 23, 1948||Aug 9, 1955||Wilson|
|US2814355 *||Sep 14, 1955||Nov 26, 1957||Gen Electric||Electrostatic gas filter|
|US2864460 *||Jan 10, 1957||Dec 16, 1958||Gen Electric||Electrode arrangement for electrostatic gas filter|
|US2917130 *||Dec 11, 1957||Dec 15, 1959||Gen Electric||Electrostatic gas filter having arrangement for cancelling captured charge|
|US2927659 *||Mar 2, 1955||Mar 8, 1960||Walter W Pabst||Dust collector|
|US2948353 *||Jan 8, 1958||Aug 9, 1960||Penney Gaylord W||Gas-cleaning precipitator|
|US2950387 *||Aug 16, 1957||Aug 23, 1960||Bell & Howell Co||Gas analysis|
|US3059394 *||Sep 8, 1959||Oct 23, 1962||Koppers Co Inc||Electrostatic precipitator|
|US3094400 *||Jul 24, 1961||Jun 18, 1963||Blanton James B||Electric air purifier|
|US3271932 *||Jul 21, 1965||Sep 13, 1966||Gen Electric||Electrostatic precipitator|
|US3520172 *||May 29, 1967||Jul 14, 1970||Univ Minnesota||Aerosol sampler|
|FR1115812A *||Title not available|
|GB892908A *||Title not available|
|IT296735A *||Title not available|
|1||*||Emanuel, A.G., Potassium Permanganate Offers New Solutions to Air Pollution Control, Reprinted from Air Engineering, September 1965, received in Patent Office April 25, 1966 (2 pages)|
|2||*||Posselt et al. Odor Abatement With Potassium Permanganate Solutions Reprinted from IEEC Product Research and Development, Vol. 4, No. 1, March 1965 pages 48 50, received in Patent Office April 25, 1966|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3955922 *||Jun 6, 1975||May 11, 1976||Robert J. Patch||Sterilizer for bathroom articles|
|US4078891 *||Apr 2, 1976||Mar 14, 1978||Men-Sie Frischluftgerate-Vertriebe Gmbh||Air purifier|
|US4118191 *||Apr 22, 1977||Oct 3, 1978||Franz Bohnensieker||Gas sterilization apparatus|
|US4227446 *||Apr 10, 1979||Oct 14, 1980||Nissan Motor Company, Limited||Electronic air cleaner for passenger compartment of vehicle|
|US4252547 *||Feb 15, 1979||Feb 24, 1981||Johnson Kenneth O||Gas cleaning unit|
|US4350504 *||Jan 28, 1980||Sep 21, 1982||Century 21 Pollution Control, Inc.||Air cleaning system|
|US4376642 *||Mar 9, 1981||Mar 15, 1983||Biotech Electronics Ltd.||Portable air cleaner unit|
|US4396407 *||Mar 11, 1982||Aug 2, 1983||Tecumseh Products Company||Multi-stage air filter|
|US4405342 *||Feb 23, 1982||Sep 20, 1983||Werner Bergman||Electric filter with movable belt electrode|
|US4468372 *||Sep 30, 1981||Aug 28, 1984||Jakob Harich||Hygienic air purifying device|
|US4491459 *||May 4, 1983||Jan 1, 1985||Pinkerton Charles J||Portable oxygen enrichment and concentration system|
|US4553992 *||Oct 17, 1984||Nov 19, 1985||Boissinot Jean Guy||Scrubber apparatus for purifying foul air produced during an embalming, an autopsy or the like|
|US4596585 *||Mar 5, 1984||Jun 24, 1986||Moeller Dade W||Method and apparatus for reduction of radon decay product exposure|
|US4627858 *||Nov 12, 1984||Dec 9, 1986||Progress - Electrogeraete||Vacuum cleaner filter|
|US4630530 *||May 9, 1984||Dec 23, 1986||Travel-Aire, Inc.||Filtering systems for buses|
|US4666478 *||Oct 16, 1985||May 19, 1987||E.F.C. Control Inc.||Scrubber apparatus for purifying foul air produced during an embalming, an autopsy or the like|
|US4750917 *||Feb 2, 1986||Jun 14, 1988||Ebara Research Co. Ltd.||Method of and apparatus for cleaning air by irradiation of ultraviolet rays|
|US4854949 *||Apr 19, 1988||Aug 8, 1989||Giles Enterprises, Inc.||Apparatus for cooking food including a ventless exhaust system|
|US4990311 *||Dec 29, 1987||Feb 5, 1991||Tohkai Kogyo Co., Ltd.||Deodorizing apparatus and method|
|US5114681 *||Mar 9, 1990||May 19, 1992||Biomedical Research And Development Laboratories, Inc.||Superfusion apparatus|
|US5129928 *||Jun 26, 1991||Jul 14, 1992||Air Innovative Systems, Inc.||Environment treatment|
|US5141706 *||Jun 30, 1989||Aug 25, 1992||Clark Donald L||Air purification unit|
|US5241449 *||Jan 21, 1992||Aug 31, 1993||Moeller Dade W||Radon decay product removal unit as adpated for use with a lamp|
|US5268009 *||Dec 22, 1992||Dec 7, 1993||Teledyne Industries, Inc.||Portable air filter system|
|US5476538 *||Jul 11, 1994||Dec 19, 1995||Japan Atomic Energy Research Institute||Method of removing aerosols by the radiation effect|
|US5492557 *||Sep 14, 1994||Feb 20, 1996||Vanella; Salvatore||Filter device for air purification|
|US5523057 *||Feb 6, 1995||Jun 4, 1996||Mazzilli; Matt||Air sterilization and filteration apparatus|
|US5612001 *||Oct 3, 1995||Mar 18, 1997||Matschke; Arthur L.||Apparatus and method for germicidal cleansing of air|
|US5681374 *||Jun 7, 1994||Oct 28, 1997||Freshman Ab||Device for the separation of microscopic particles out of air|
|US5716431 *||Jun 6, 1995||Feb 10, 1998||Freshman Ab||Device for separating extremely fine particles from air|
|US5735918 *||Nov 19, 1996||Apr 7, 1998||Barradas; George||Combination air freshener and air filter|
|US5759239 *||May 7, 1997||Jun 2, 1998||Yu; Chi-Chin||Air purifier|
|US5817276 *||Feb 20, 1997||Oct 6, 1998||Steril-Aire U.S.A., Inc.||Method of UV distribution in an air handling system|
|US5837040 *||Sep 9, 1996||Nov 17, 1998||International Decontamination Systems Llc||Room air decontamination device|
|US5879435 *||Jan 6, 1997||Mar 9, 1999||Carrier Corporation||Electronic air cleaner with germicidal lamp|
|US5938823 *||Apr 18, 1997||Aug 17, 1999||Carrier Corporation||Integrated electrostatic collection and microwave sterilization for bioaerosol air purification|
|US6019815 *||Sep 11, 1998||Feb 1, 2000||Carrier Corporation||Method for preventing microbial growth in an electronic air cleaner|
|US6149717 *||Dec 22, 1998||Nov 21, 2000||Carrier Corporation||Electronic air cleaner with germicidal lamp|
|US6221314||Nov 4, 1997||Apr 24, 2001||Wil Bigelow||Air actinism chamber apparatus and method|
|US6245293||Oct 14, 1998||Jun 12, 2001||Steril-Aire U.S.A., Inc.||Cleaning and maintaining a drain pan in an air handling system|
|US6267924||Oct 14, 1998||Jul 31, 2001||Steril-Aire U.S.A., Inc.||Reduction of pressure drop of a cooling or heating system|
|US6280686||Oct 14, 1998||Aug 28, 2001||Steril-Aire U.S.A., Inc.||Control of health hazards in an air handler|
|US6313470||Oct 13, 1998||Nov 6, 2001||Steril-Aire, U.S.A. Inc.||Returning a heat exchanger's efficiency to “as new”|
|US6336946 *||Feb 21, 1995||Jan 8, 2002||Dana Corporation||Shift pleat air filter|
|US6487868 *||Feb 8, 2001||Dec 3, 2002||Matsushita Electric Industrial Co., Ltd.||Air conditioner and method for controlling air conditioner|
|US6500267||Oct 6, 1998||Dec 31, 2002||Net Zero, Inc.||Reduction of energy consumption in a cooling or heating system through UVC irradiation|
|US6500387||May 19, 2000||Dec 31, 2002||Nukuest, Inc.||Air actinism chamber apparatus and method|
|US6568201 *||Nov 29, 2001||May 27, 2003||Whirlpool Corporation||Hybrid window/split air treatment appliance|
|US6589476||Aug 13, 1999||Jul 8, 2003||Steril-Aire Usa, Inc.||Reducing volatile organic compounds and common organic odors to below threshold levels in a mechanically ventilated space|
|US6709484||Aug 8, 2001||Mar 23, 2004||Sharper Image Corporation||Electrode self-cleaning mechanism for electro-kinetic air transporter conditioner devices|
|US6713026||Dec 5, 2000||Mar 30, 2004||Sharper Image Corporation||Electro-kinetic air transporter-conditioner|
|US6730141||Jul 11, 2002||May 4, 2004||Eads Deutschland Gmbh||Device and method for selectively removing gaseous pollutants from the ambient air|
|US6749667||Oct 21, 2002||Jun 15, 2004||Sharper Image Corporation||Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices|
|US6896853||Sep 9, 2003||May 24, 2005||Sharper Image Corporation||Personal electro-kinetic air transporter-conditioner|
|US6908501||Apr 30, 2004||Jun 21, 2005||Sharper Image Corporation||Electrode self-cleaning mechanism for air conditioner devices|
|US6911186 *||Feb 12, 2002||Jun 28, 2005||Sharper Image Corporation||Electro-kinetic air transporter and conditioner device with enhanced housing configuration and enhanced anti-microorganism capability|
|US6939397||May 10, 2004||Sep 6, 2005||Eco-Rx, Inc.||System for purifying and removing contaminants from gaseous fluids|
|US6953556||Mar 30, 2004||Oct 11, 2005||Sharper Image Corporation||Air conditioner devices|
|US6955708 *||Dec 6, 2004||Oct 18, 2005||Shaklee Corporation||Air-treatment apparatus and methods|
|US6972057||Mar 22, 2004||Dec 6, 2005||Sharper Image Corporation||Electrode cleaning for air conditioner devices|
|US6974560||Feb 12, 2002||Dec 13, 2005||Sharper Image Corporation||Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability|
|US6984987||Jul 23, 2003||Jan 10, 2006||Sharper Image Corporation||Electro-kinetic air transporter and conditioner devices with enhanced arching detection and suppression features|
|US7056370||Mar 23, 2005||Jun 6, 2006||Sharper Image Corporation||Electrode self-cleaning mechanism for air conditioner devices|
|US7077890||Feb 9, 2004||Jul 18, 2006||Sharper Image Corporation||Electrostatic precipitators with insulated driver electrodes|
|US7097695||Sep 12, 2003||Aug 29, 2006||Sharper Image Corporation||Ion emitting air-conditioning devices with electrode cleaning features|
|US7175814||Jun 16, 2003||Feb 13, 2007||Dionisio James L||Air disinfecting system and cartridge device containing ultraviolet light|
|US7220295||Apr 12, 2004||May 22, 2007||Sharper Image Corporation||Electrode self-cleaning mechanisms with anti-arc guard for electro-kinetic air transporter-conditioner devices|
|US7285155||Mar 28, 2005||Oct 23, 2007||Taylor Charles E||Air conditioner device with enhanced ion output production features|
|US7291207||Dec 8, 2004||Nov 6, 2007||Sharper Image Corporation||Air treatment apparatus with attachable grill|
|US7311762||Jul 25, 2005||Dec 25, 2007||Sharper Image Corporation||Air conditioner device with a removable driver electrode|
|US7318856||Dec 3, 2004||Jan 15, 2008||Sharper Image Corporation||Air treatment apparatus having an electrode extending along an axis which is substantially perpendicular to an air flow path|
|US7323065||Aug 25, 2003||Jan 29, 2008||Sieni-Aire, Inc||UV irradiation for surface cleaning|
|US7326387||May 8, 2003||Feb 5, 2008||Theodore A. M. Arts||Air decontamination devices|
|US7371354||Sep 15, 2003||May 13, 2008||Sharper Image Corporation||Treatment apparatus operable to adjust output based on variations in incoming voltage|
|US7404935||Oct 14, 2003||Jul 29, 2008||Sharper Image Corp||Air treatment apparatus having an electrode cleaning element|
|US7405672||Mar 25, 2004||Jul 29, 2008||Sharper Image Corp.||Air treatment device having a sensor|
|US7498004||Oct 30, 2002||Mar 3, 2009||Honeywell International Inc.||Ultraviolet disinfecting apparatus|
|US7517503||Mar 2, 2004||Apr 14, 2009||Sharper Image Acquisition Llc||Electro-kinetic air transporter and conditioner devices including pin-ring electrode configurations with driver electrode|
|US7517504||Mar 8, 2004||Apr 14, 2009||Taylor Charles E||Air transporter-conditioner device with tubular electrode configurations|
|US7517505||Dec 8, 2004||Apr 14, 2009||Sharper Image Acquisition Llc||Electro-kinetic air transporter and conditioner devices with 3/2 configuration having driver electrodes|
|US7534356||Apr 12, 2006||May 19, 2009||Honeywell International Inc.||Apparatus for disinfecting fluid using ultraviolet radiation|
|US7638104||Dec 3, 2004||Dec 29, 2009||Sharper Image Acquisition Llc||Air conditioner device including pin-ring electrode configurations with driver electrode|
|US7662348||Jun 10, 2005||Feb 16, 2010||Sharper Image Acquistion LLC||Air conditioner devices|
|US7695690||Feb 12, 2002||Apr 13, 2010||Tessera, Inc.||Air treatment apparatus having multiple downstream electrodes|
|US7724492||Jul 20, 2007||May 25, 2010||Tessera, Inc.||Emitter electrode having a strip shape|
|US7767165||Mar 3, 2005||Aug 3, 2010||Sharper Image Acquisition Llc||Personal electro-kinetic air transporter-conditioner|
|US7767169||Nov 22, 2004||Aug 3, 2010||Sharper Image Acquisition Llc||Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds|
|US7833322||Feb 27, 2007||Nov 16, 2010||Sharper Image Acquisition Llc||Air treatment apparatus having a voltage control device responsive to current sensing|
|US7897118||Dec 8, 2004||Mar 1, 2011||Sharper Image Acquisition Llc||Air conditioner device with removable driver electrodes|
|US7906080||Mar 30, 2007||Mar 15, 2011||Sharper Image Acquisition Llc||Air treatment apparatus having a liquid holder and a bipolar ionization device|
|US7959869||May 9, 2003||Jun 14, 2011||Sharper Image Acquisition Llc||Air treatment apparatus with a circuit operable to sense arcing|
|US7976615||Mar 12, 2010||Jul 12, 2011||Tessera, Inc.||Electro-kinetic air mover with upstream focus electrode surfaces|
|US8043573||Feb 8, 2010||Oct 25, 2011||Tessera, Inc.||Electro-kinetic air transporter with mechanism for emitter electrode travel past cleaning member|
|US8252099||Mar 26, 2010||Aug 28, 2012||Lifeaire Systems, Llc||Air filtration device|
|US8252100||Sep 26, 2011||Aug 28, 2012||Lifeaire Systems, Llc||Air filtration device|
|US8409328 *||Mar 18, 2010||Apr 2, 2013||Tokyo Electron Limited||Substrate transfer device and substrate transfer method|
|US8425658||May 20, 2011||Apr 23, 2013||Tessera, Inc.||Electrode cleaning in an electro-kinetic air mover|
|US8564924||Oct 14, 2009||Oct 22, 2013||Global Plasma Solutions, Llc||Systems and methods of air treatment using bipolar ionization|
|US8747505||Jun 21, 2011||Jun 10, 2014||Clarcor Air Filtration Products, Inc.||V-bank air filtration system such as for animal confinement|
|US8861168||Sep 25, 2013||Oct 14, 2014||Global Plasma Solutions, Llc||Ion generator device|
|US9034068||Jun 4, 2013||May 19, 2015||Clarcor Air Filtration Products, Inc.||Box filter with orientation device|
|US9049838||May 24, 2012||Jun 9, 2015||Clarcor Air Filtration Products, Inc.||Filter frame housing and filter for animal confinement building|
|US9049839||May 24, 2012||Jun 9, 2015||Clarcor Air Filtration Products, Inc.||Filter system using plastic frames along structural wall of animal confinement building|
|US9126135||May 24, 2012||Sep 8, 2015||Clarcor Air Filtration Products, Inc.||V-bank air filtration system such as for animal confinement|
|US9168538||Sep 8, 2014||Oct 27, 2015||Global Plasma Solutions, Llc||Ion generator mounting device|
|US9185877||May 24, 2012||Nov 17, 2015||Clarcor Air Filtration Products, Inc.||Collapsible and/or assembled filter housing and filter used therewith|
|US9283295 *||Jan 25, 2013||Mar 15, 2016||Rgf Environmental Group, Inc.||Add on filter and air filtration system and method|
|US9289779||Sep 8, 2014||Mar 22, 2016||Global Plasma Solutions||Ion generator device|
|US9433693||May 21, 2014||Sep 6, 2016||Aerobiotix, Inc.||Air-surface disinfection system, unit and method|
|US9457119||Mar 15, 2013||Oct 4, 2016||Aerobiotix, Inc.||Fluid sterilization system|
|US9478948||Sep 22, 2015||Oct 25, 2016||Global Plasma Solutions, Llc||Ion generator mounting device|
|US9509125||Feb 10, 2016||Nov 29, 2016||Global Plasma Solutions||Ion generator device|
|US9510557||May 24, 2012||Dec 6, 2016||Clarcor Air Filtration Products, Inc.||Non V-bank filter for animal confinement facility|
|US9522210||Mar 11, 2016||Dec 20, 2016||Lifeaire Systems, Llc||Methods of purifying air|
|US20020098131 *||Dec 13, 2001||Jul 25, 2002||Sharper Image Corporation||Electro-kinetic air transporter-conditioner device with enhanced cleaning features|
|US20020106303 *||Feb 2, 2001||Aug 8, 2002||Paul Stiros||Apparatus and method for deodorizing confined air spaces which utilize baking soda|
|US20020127156 *||Feb 12, 2002||Sep 12, 2002||Taylor Charles E.||Electro-kinetic air transporter-conditioner devices with enhanced collector electrode|
|US20020134665 *||Feb 12, 2002||Sep 26, 2002||Taylor Charles E.||Electro-kinetic air transporter-conditioner devices with trailing electrode|
|US20020146356 *||Feb 12, 2002||Oct 10, 2002||Sinaiko Robert J.||Dual input and outlet electrostatic air transporter-conditioner|
|US20020155041 *||Feb 12, 2002||Oct 24, 2002||Mckinney Edward C.||Electro-kinetic air transporter-conditioner with non-equidistant collector electrodes|
|US20030019355 *||Jul 11, 2002||Jan 30, 2003||Johann Goebel||Device and method for selectively removing gaseous pollutants from the ambient air|
|US20030072697 *||Nov 26, 2002||Apr 17, 2003||Sharper Image Corporation||Apparatus for conditioning air|
|US20030086848 *||Oct 30, 2002||May 8, 2003||Honeywell International Inc.||Ultraviolet disinfecting apparatus|
|US20030147783 *||Feb 27, 2003||Aug 7, 2003||Taylor Charles E.||Apparatuses for conditioning air with means to extend exposure time to anti-microorganism lamp|
|US20030165410 *||Mar 5, 2003||Sep 4, 2003||Taylor Charles E.||Personal air transporter-conditioner devices with anti -microorganism capability|
|US20030170150 *||Mar 12, 2003||Sep 11, 2003||Sharper Image Corporation||Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices|
|US20030206837 *||Feb 12, 2002||Nov 6, 2003||Taylor Charles E.||Electro-kinetic air transporter and conditioner device with enhanced maintenance features and enhanced anti-microorganism capability|
|US20030206839 *||Feb 12, 2002||Nov 6, 2003||Taylor Charles E.||Electro-kinetic air transporter and conditioner device with enhanced anti-microorganism capability|
|US20030206840 *||Feb 12, 2002||Nov 6, 2003||Taylor Charles E.||Electro-kinetic air transporter and conditioner device with enhanced housing configuration and enhanced anti-microorganism capability|
|US20030209420 *||May 9, 2003||Nov 13, 2003||Sharper Image Corporation||Electro-kinetic air transporter and conditioner devices with special detectors and indicators|
|US20030217641 *||Feb 6, 2003||Nov 27, 2003||Palestro Richard P.||Ultraviolet germicidal apparatus and method|
|US20030233935 *||Oct 21, 2002||Dec 25, 2003||Reeves John Paul||Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices|
|US20040003721 *||Apr 21, 2003||Jan 8, 2004||Sharper Image Corporation||Electrode self-cleaning mechanism for electro-kinetic air transporter-conditioner devices|
|US20040047775 *||Sep 9, 2003||Mar 11, 2004||Sharper Image Corporation||Personal electro-kinetic air transporter-conditioner|
|US20040055620 *||Aug 25, 2003||Mar 25, 2004||Fencl Forrest B.||UV irradiation for surface cleaning|
|US20040057882 *||Sep 12, 2003||Mar 25, 2004||Sharper Image Corporation||Ion emitting air-conditioning devices with electrode cleaning features|
|US20040146437 *||May 8, 2003||Jul 29, 2004||Arts Theodore A.M.||Air decontamination devices|
|US20040166037 *||Feb 25, 2003||Aug 26, 2004||Youdell Harry F.||Air filtration and treatment apparatus|
|US20040175290 *||Mar 6, 2003||Sep 9, 2004||Steril-Aire Usa, Inc.||Treatment of air and surfaces in a food processing plant|
|US20040179981 *||Mar 22, 2004||Sep 16, 2004||Sharper Image Corporation||Electrode cleaning for air conditioner devices|
|US20040191134 *||Mar 30, 2004||Sep 30, 2004||Sharper Image Corporation||Air conditioner devices|
|US20040234431 *||Jun 25, 2004||Nov 25, 2004||Sharper Image Corporation||Electro-kinetic air transporter-conditioner devices with trailing electrode|
|US20040237787 *||Apr 30, 2004||Dec 2, 2004||Sharper Image Corporation||Electrode self-cleaning mechanism for air conditioner devices|
|US20040251124 *||Sep 15, 2003||Dec 16, 2004||Sharper Image Corporation||Electro-kinetic air transporter and conditioner devices with features that compensate for variations in line voltage|
|US20040251909 *||Jul 23, 2003||Dec 16, 2004||Sharper Image Corporation||Electro-kinetic air transporter and conditioner devices with enhanced arching detection and suppression features|
|US20040252134 *||Aug 26, 2003||Dec 16, 2004||Ankur Bhatt||Designing business content for reporting|
|US20050000793 *||Jul 21, 2004||Jan 6, 2005||Sharper Image Corporation||Air conditioner device with trailing electrode|
|US20050082160 *||Oct 15, 2003||Apr 21, 2005||Sharper Image Corporation||Electro-kinetic air transporter and conditioner devices with a mesh collector electrode|
|US20050146712 *||Dec 24, 2003||Jul 7, 2005||Lynx Photonics Networks Inc.||Circuit, system and method for optical switch status monitoring|
|US20050147545 *||Mar 3, 2005||Jul 7, 2005||Sharper Image Corporation||Personal electro-kinetic air transporter-conditioner|
|US20050175498 *||Jul 30, 2003||Aug 11, 2005||Jerry Nelson||Method and apparatus for producing purified or ozone enriched air to remove contaminants from fluids|
|US20060005703 *||Jun 30, 2005||Jan 12, 2006||Chi-Hsiang Wang||Ultraviolet air purifier having multiple charged collection plates|
|US20060005706 *||Jul 9, 2004||Jan 12, 2006||Yuen Se K||Electro-optical air sterilizer with ionizer|
|US20060186059 *||Apr 12, 2006||Aug 24, 2006||Honeywell International Inc.||Apparatus for disinfecting fluid using ultraviolet radiation|
|US20060263272 *||Jun 16, 2003||Nov 23, 2006||Dionisio James L||Cartridge device containing uvc for air disinfection. "uvbio-clean"|
|US20070012188 *||Jul 5, 2006||Jan 18, 2007||Tandon Hans P||Apparatus and method for removing contaminants from a gas stream|
|US20080271603 *||May 4, 2007||Nov 6, 2008||The Dial Corporation||Air purification system and method of purifying air|
|US20090263293 *||May 9, 2007||Oct 22, 2009||Kanji Motegi||Electric discharge device and air purification device|
|US20100236405 *||Mar 18, 2010||Sep 23, 2010||Tokyo Electron Limited||Substrate transfer device and substrate transfer method|
|US20110232481 *||Mar 26, 2010||Sep 29, 2011||Worrilow Kathryn C||Air Filtration Device|
|US20120294999 *||Jul 27, 2012||Nov 22, 2012||Gold Medal Products Co.||Self contained popcorn popper|
|US20140212327 *||Jan 25, 2013||Jul 31, 2014||Rgf Environmental Group, Inc.||Add on filter and air filtration system and method|
|US20160136609 *||Nov 14, 2014||May 19, 2016||Rgf Environmental Group, Inc.||Device, system, and method for producing advanced oxidation products|
|USRE41812||Jan 21, 2005||Oct 12, 2010||Sharper Image Acquisition Llc||Electro-kinetic air transporter-conditioner|
|CN102933281A *||Mar 23, 2011||Feb 13, 2013||LifeAire系统有限责任公司||Air filtration device|
|CN102933281B *||Mar 23, 2011||Nov 25, 2015||LifeAire系统有限责任公司||空气过滤装置|
|CN104456757A *||Dec 28, 2014||Mar 25, 2015||巫贤华||Novel air purification temperature adjustor|
|EP0852321A2||Dec 15, 1997||Jul 8, 1998||Carrier Corporation||Electronic air cleaner with germicidal lamp|
|EP0852321A3 *||Dec 15, 1997||Dec 6, 2000||Carrier Corporation||Electronic air cleaner with germicidal lamp|
|EP1014006A2||Nov 22, 1999||Jun 28, 2000||Carrier Corporation||Electronic air cleaner with germicidal lamp|
|EP1278021A2 *||Jul 2, 2002||Jan 22, 2003||EADS Deutschland GmbH||Device and method for selectively removing gaseous pollutants from room air|
|EP1278021A3 *||Jul 2, 2002||May 2, 2003||EADS Deutschland GmbH||Device and method for selectively removing gaseous pollutants from room air|
|WO1991000708A1 *||Jul 11, 1990||Jan 24, 1991||Shydar Advanced Air Cleaning Systems, Inc.||An air cleaning unit|
|WO1991014218A1 *||Mar 7, 1991||Sep 19, 1991||Joseph Bertoncini||Superfusion apparatus|
|WO2003026799A1 *||Sep 23, 2002||Apr 3, 2003||The Johns Hopkins University||Removal of elemental mercury by photoionization|
|WO2011119691A1 *||Mar 23, 2011||Sep 29, 2011||Worrilow Kathryn C||Air filtration device|
|U.S. Classification||96/16, 55/521, 96/27, 55/524, 55/528, 96/296, 422/4, 55/315, 422/5, 422/124, 422/24, 422/121|
|International Classification||F24F3/16, B03C3/155, B01D50/00, B03C3/04|
|Cooperative Classification||F24F3/16, B01D50/00, B03C3/155, A61L9/22, A61L9/20|
|European Classification||B03C3/155, B01D50/00, F24F3/16, A61L9/20, A61L9/22|