CA1229121A - Colour display tube - Google Patents
Colour display tubeInfo
- Publication number
- CA1229121A CA1229121A CA000478667A CA478667A CA1229121A CA 1229121 A CA1229121 A CA 1229121A CA 000478667 A CA000478667 A CA 000478667A CA 478667 A CA478667 A CA 478667A CA 1229121 A CA1229121 A CA 1229121A
- Authority
- CA
- Canada
- Prior art keywords
- colour
- heavy metal
- display tube
- layer
- glass layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
- H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
- H01J9/146—Surface treatment, e.g. blackening, coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0777—Coatings
Abstract
ABSTRACT
The invention relates to a colour display tube comprising a shadow mask (12) placed in front of the display screen (8). The shadow mask (12), at least on the side remote from the display screen, is coated with a glass layer (14) containing a heavy metal. The object of such a layer (14) is to reflect electrons incident on it so as to reduce local or overall heating. When the heavy metal-containing layer is a glass layer, this layer has a smaller tendency to form particles than does a non-vitreous layer of a compound of a heavy metal. This is in favour of the picture quality, and the shadow mask is more rigid.
The invention relates to a colour display tube comprising a shadow mask (12) placed in front of the display screen (8). The shadow mask (12), at least on the side remote from the display screen, is coated with a glass layer (14) containing a heavy metal. The object of such a layer (14) is to reflect electrons incident on it so as to reduce local or overall heating. When the heavy metal-containing layer is a glass layer, this layer has a smaller tendency to form particles than does a non-vitreous layer of a compound of a heavy metal. This is in favour of the picture quality, and the shadow mask is more rigid.
Description
~2Z9~
PEN. 10.979 : The invention relates to a color display tube comprising in an evacuated envelope means to generate a rNm~er of electron beams,: a display screen having regions luminescing in different allures and a color selection electrode which is present near the:
: S display screen and:has:apertures for passing the electron beams and : associating each electron beam with luminescent regions of one colour,:said oilier selection electrode being coated at least on : the side remote from the display screen with allayer which comprises : a heavy metal. The invention further relates to a method of menu-10 .fac~uring such a color display tube.
Heavy mottles to be understood to mean hereinafter a metal having an atomic number higher than 70.
A color display tube of the type mentioned in the opening ; paragraph is known, for exa~ple,.from our.Canadian.Patent 1,180,368 which issued on January 2, 1985.
This Patent describes thought color display tube having a Jo colour~selection electrode which on the side remote from the disk : : play screen is coated with allayer of a material.oomprising a heavy I: metal, during operation shows considerably less likelier overallDomingo as a result of which the.colour purity of the:a~lour display : tube would deteriorate.
As a matter of fact Allah go part of the electrons, on their White the display screener intercepted by the.colour selection electrode, sometimes termed shadow mask,. and cause local .25 or entire heating of the shadow mask and hence doming. Allayer I: with heavy metal.on~the side of the allure selection electrode where the electron beams are incidents for its effect that the ; electron beams are~refracte~ more strongly beyond the apertures . and give less rise to heating and doming.
It is also stated already in the above-mentioned literature reference that, depending on the increase of the thickness of the heavy metal-containing:layer, the possibility of the occurrence of lcose:particles in the tube increases. These loose particles may give I: rise inter aria in the electron gun to high voltage flashovers and _ _ .
~iL22912~L
PUN 10.979 2 24-08-1984 to black spots in the picture displayed on the display screen One of the objects of the invention is to prevent loose particles from being formed in the tube by the action of the electron beams on the heavymetaI~ontaining layer.
Another problem occurring in the color display tube is the following. me color selection electrode owes its rigidity for a considerable part to its curvature. In creasing the radius of curvature weakens the mask. In the present-day developments of the color display tube, then is a tendency to make the screen less ; 10 convex or even flat. It is then desired to make the color selection electrode lyre rigid.
Another object of the invention is to provide a more rigid color selection electrode.
according to toe invention. the color display tube mentioned lo in the opening paragraph is therefore characterized in that the heavy metal containing layer on the color selection electrode is a glass layer havirlg a forming temperature which is at most equal to the temperature of the manufacture on the envelope from the display screen and a cone.
By meals of a glass layer it is achieved that particles cannot easily be detached from the heavy metal containing layer, as well as that the color selection electrode as a whole becomes more rigid. By means of a glass layer having the indicated forming temperature it is achieved that no additional thermal treatments 25 for the manufacture of the color display tube according to the invention are necessary.
e heavy metal is preferably lead. By means of lead, good glass layers can be obtained on a color selection electrode.
In addition to the heavy metal; at least one glass-forming 30 component is present in the glass layer. Boron is preferably present in the / a glass-fonmm g component.
Particularly good results are obtained when the glass layer is a lead borate glass containing at least 50% by weight of lead oxide.
The glass layer preferably consists of 76-80 % by weight (52-56 mol. 4) of lead oxide, 15-20 by weight ~33-45 Mel. %) of boric oxide, 0~6 % by weight (0-11 mol. %) of zinc oxide and 0.5-2 by weight (1-4 mol. I) of cobalt oxide (Co 0). A glass ~;~Z912~
PUN 10.979 3 24-08-1984 layer having such a composition is very suitable as regards co-efficient of expansion, melting properties and adhesion to the substrate.
The glass layer comprising the heavy metal is preferably provided on the color selection electrode by spraying a suspension containing lead oxide and boric oxide on the color selection electrode while on the other side of the color selection electrode a sub-ambient pressure is maintained.
By means of this method it is achieved that no or hardly any particles are deposited on the walls of the apertures in the color selection electrode so that afterwards no increased reflections occur at the said walls and the picture quality is not impaired.
In a subsequent thermal treatment at, for example, approximately 440C, the glass layer is formed and the glass layer does 15 not flow into the apertures. Preferably, the thermal treatment simply coincides with the stage of manufacture of the color display tube in which the display screen and the cone are sealed together.
me invention will now be described in greater detail with reference to an example and the accompanying drawing, in which:
Fig. 1 shows diagrammatically a color display tube according to the invention and Fig. 2 is a sectional view of a part of the color selection electrode of the tube shown in fig. 1.
The color display babe shown dlagram~latically in fig. 1 25 comprises a glass envelope 1 in which three (diagrammatically shown) electron guns 2, 3 and 4 are present to generate three electron beams 5, 6 and 7.
A display screen is built up from a repeating pattern of phosphor stripes 9, 10 and 11 which lump Miss in blue, green and red 30 and are respectively associated with the electron beams 5, 6 and 7 in such a manner that each electron beam impinges only on phosphor stripes of one color.
This is realized in known manner by means of a color selection electrode (shadow mask) 12 which is placed at a short 35 distance before the display screen 8 and which comprises rows of apertures 13 which pass a part of each of the electron beams 5, 6 and 7.
Only approximately 20% of the electrons, on their way -to the display screen 8, pass through the apertures 13. In order to 9~L2~
PUN 10.979 4 24-0~-1984 avoid local or overall heating of the shadow mask, an electron reflective layer 14 is provided which contains a heavy metal (see fig. 2).
In order to avoid crumbling away of the layer 14 and to increase the rigidity of the oilier selection electrode 13 as a whole, according to the invention the layer 14 on the color selection electrode is a glass layer having a forming temperature which is at most equal to the temperature of manufacturing the envelope 1 from the display screen 8 and a cone 16.
The heavy metal advantageously is lead, and boron is present in the glass layer 14 in a glass-forming component. A glass ` layer 14 consisting of a lead borate glass has proved to be very - suitable. A lead borate glass 14 comprises, for example, 0.25 my of Pub and 0.04 my of B per cm2. The glass layer 14 is provided from an aqueous suspension of a mixture consisting of approximately 16 by weight of boric oxide, 4 % by weight of zinc oxide, 79 %
by weight of lead oxide and 1 % by weight of cobalt oxide. me coefficient of expansion of the glass~¢orresponds closely to that of the iron color selection electrode 12.
The said aqueous suspension is sprayed onto the color selection electrode. During spraying, an air flow is maintained in the mask apertures 13 by exhausting the air on the non-sprayed side of the mask 12 by means of a vacuum pump. By means of these measures it is achieved that at most only little suspension lands 25 on the edge 15 (Fig. 2) of the apertures 13 so that no undesired electron reflection (taper reflection) takes place on said walls during operation of the tube.
me glass layer is formed by a thermal treatment of the shadow mask at approximately 44 I the melting properties of the glass used being such that substantially no material lands in the apertures 13.
The coefficient of reflection for electrons of the layer 14 is approximately 45 %. mix results in a lower temperature of the mask 12 than in the absence of the layer 14 and hence in a smaller overall and local doming of the shadow mask. me thermal treatment simply coincides with the step in which the display screen 8 and the cone 16 of the color display tube are sealed by form the envelope 1.
" ~2~2~12~:
PUN 10.979 me invention is not restricted to the example described but may be varied in many manners by those skilled in the art without departmg from the scope of this invention.
I
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:1 :
: . :
, :
;
I' ':` ,
PEN. 10.979 : The invention relates to a color display tube comprising in an evacuated envelope means to generate a rNm~er of electron beams,: a display screen having regions luminescing in different allures and a color selection electrode which is present near the:
: S display screen and:has:apertures for passing the electron beams and : associating each electron beam with luminescent regions of one colour,:said oilier selection electrode being coated at least on : the side remote from the display screen with allayer which comprises : a heavy metal. The invention further relates to a method of menu-10 .fac~uring such a color display tube.
Heavy mottles to be understood to mean hereinafter a metal having an atomic number higher than 70.
A color display tube of the type mentioned in the opening ; paragraph is known, for exa~ple,.from our.Canadian.Patent 1,180,368 which issued on January 2, 1985.
This Patent describes thought color display tube having a Jo colour~selection electrode which on the side remote from the disk : : play screen is coated with allayer of a material.oomprising a heavy I: metal, during operation shows considerably less likelier overallDomingo as a result of which the.colour purity of the:a~lour display : tube would deteriorate.
As a matter of fact Allah go part of the electrons, on their White the display screener intercepted by the.colour selection electrode, sometimes termed shadow mask,. and cause local .25 or entire heating of the shadow mask and hence doming. Allayer I: with heavy metal.on~the side of the allure selection electrode where the electron beams are incidents for its effect that the ; electron beams are~refracte~ more strongly beyond the apertures . and give less rise to heating and doming.
It is also stated already in the above-mentioned literature reference that, depending on the increase of the thickness of the heavy metal-containing:layer, the possibility of the occurrence of lcose:particles in the tube increases. These loose particles may give I: rise inter aria in the electron gun to high voltage flashovers and _ _ .
~iL22912~L
PUN 10.979 2 24-08-1984 to black spots in the picture displayed on the display screen One of the objects of the invention is to prevent loose particles from being formed in the tube by the action of the electron beams on the heavymetaI~ontaining layer.
Another problem occurring in the color display tube is the following. me color selection electrode owes its rigidity for a considerable part to its curvature. In creasing the radius of curvature weakens the mask. In the present-day developments of the color display tube, then is a tendency to make the screen less ; 10 convex or even flat. It is then desired to make the color selection electrode lyre rigid.
Another object of the invention is to provide a more rigid color selection electrode.
according to toe invention. the color display tube mentioned lo in the opening paragraph is therefore characterized in that the heavy metal containing layer on the color selection electrode is a glass layer havirlg a forming temperature which is at most equal to the temperature of the manufacture on the envelope from the display screen and a cone.
By meals of a glass layer it is achieved that particles cannot easily be detached from the heavy metal containing layer, as well as that the color selection electrode as a whole becomes more rigid. By means of a glass layer having the indicated forming temperature it is achieved that no additional thermal treatments 25 for the manufacture of the color display tube according to the invention are necessary.
e heavy metal is preferably lead. By means of lead, good glass layers can be obtained on a color selection electrode.
In addition to the heavy metal; at least one glass-forming 30 component is present in the glass layer. Boron is preferably present in the / a glass-fonmm g component.
Particularly good results are obtained when the glass layer is a lead borate glass containing at least 50% by weight of lead oxide.
The glass layer preferably consists of 76-80 % by weight (52-56 mol. 4) of lead oxide, 15-20 by weight ~33-45 Mel. %) of boric oxide, 0~6 % by weight (0-11 mol. %) of zinc oxide and 0.5-2 by weight (1-4 mol. I) of cobalt oxide (Co 0). A glass ~;~Z912~
PUN 10.979 3 24-08-1984 layer having such a composition is very suitable as regards co-efficient of expansion, melting properties and adhesion to the substrate.
The glass layer comprising the heavy metal is preferably provided on the color selection electrode by spraying a suspension containing lead oxide and boric oxide on the color selection electrode while on the other side of the color selection electrode a sub-ambient pressure is maintained.
By means of this method it is achieved that no or hardly any particles are deposited on the walls of the apertures in the color selection electrode so that afterwards no increased reflections occur at the said walls and the picture quality is not impaired.
In a subsequent thermal treatment at, for example, approximately 440C, the glass layer is formed and the glass layer does 15 not flow into the apertures. Preferably, the thermal treatment simply coincides with the stage of manufacture of the color display tube in which the display screen and the cone are sealed together.
me invention will now be described in greater detail with reference to an example and the accompanying drawing, in which:
Fig. 1 shows diagrammatically a color display tube according to the invention and Fig. 2 is a sectional view of a part of the color selection electrode of the tube shown in fig. 1.
The color display babe shown dlagram~latically in fig. 1 25 comprises a glass envelope 1 in which three (diagrammatically shown) electron guns 2, 3 and 4 are present to generate three electron beams 5, 6 and 7.
A display screen is built up from a repeating pattern of phosphor stripes 9, 10 and 11 which lump Miss in blue, green and red 30 and are respectively associated with the electron beams 5, 6 and 7 in such a manner that each electron beam impinges only on phosphor stripes of one color.
This is realized in known manner by means of a color selection electrode (shadow mask) 12 which is placed at a short 35 distance before the display screen 8 and which comprises rows of apertures 13 which pass a part of each of the electron beams 5, 6 and 7.
Only approximately 20% of the electrons, on their way -to the display screen 8, pass through the apertures 13. In order to 9~L2~
PUN 10.979 4 24-0~-1984 avoid local or overall heating of the shadow mask, an electron reflective layer 14 is provided which contains a heavy metal (see fig. 2).
In order to avoid crumbling away of the layer 14 and to increase the rigidity of the oilier selection electrode 13 as a whole, according to the invention the layer 14 on the color selection electrode is a glass layer having a forming temperature which is at most equal to the temperature of manufacturing the envelope 1 from the display screen 8 and a cone 16.
The heavy metal advantageously is lead, and boron is present in the glass layer 14 in a glass-forming component. A glass ` layer 14 consisting of a lead borate glass has proved to be very - suitable. A lead borate glass 14 comprises, for example, 0.25 my of Pub and 0.04 my of B per cm2. The glass layer 14 is provided from an aqueous suspension of a mixture consisting of approximately 16 by weight of boric oxide, 4 % by weight of zinc oxide, 79 %
by weight of lead oxide and 1 % by weight of cobalt oxide. me coefficient of expansion of the glass~¢orresponds closely to that of the iron color selection electrode 12.
The said aqueous suspension is sprayed onto the color selection electrode. During spraying, an air flow is maintained in the mask apertures 13 by exhausting the air on the non-sprayed side of the mask 12 by means of a vacuum pump. By means of these measures it is achieved that at most only little suspension lands 25 on the edge 15 (Fig. 2) of the apertures 13 so that no undesired electron reflection (taper reflection) takes place on said walls during operation of the tube.
me glass layer is formed by a thermal treatment of the shadow mask at approximately 44 I the melting properties of the glass used being such that substantially no material lands in the apertures 13.
The coefficient of reflection for electrons of the layer 14 is approximately 45 %. mix results in a lower temperature of the mask 12 than in the absence of the layer 14 and hence in a smaller overall and local doming of the shadow mask. me thermal treatment simply coincides with the step in which the display screen 8 and the cone 16 of the color display tube are sealed by form the envelope 1.
" ~2~2~12~:
PUN 10.979 me invention is not restricted to the example described but may be varied in many manners by those skilled in the art without departmg from the scope of this invention.
I
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Claims (7)
1. A colour display tube comprising in an evacuated envelope means for generating a number of electron beams, a display screen having regions luminescing in different colours and a colour selection electrode which is situated near the display screen and has apertures for passing the electron beams and associating each electron beam with luminescent regions of one colour, said colour selection electrode being coated at least on the side remote from the display screen with a layer which comprises a heavy metal, characterized in that the heavy metal-containing layer on the colour selection electrode is a glass layer having a forming temperature which is at most equal to the temperature of manu-facturing the envelope from the display screen and a cone.
2. A colour display tube as claimed in Claim 1, char-acterized in that the heavy metal is lead.
3. A colour display tube as claimed in Claim 1, char-acterized in that in addition to the heavy metal the glass layer comprises boric oxide as a glass-forming component.
4. A colour display tube as claimed in Claim 3, char-acterized in that the glass layer is a lead borate glass.
5. A colour display tube as claimed in Claim 4, char-acterized in that the glass layer consists of 76-80 % by weight (52-56 mol.%) of lead oxide, 15-20 % by weight (33-45 mol.%) of boric oxide, 0-6 % by weight (0-11 mol.%) of zinc oxide and 0.5-2 % by weight (1-4 mol. %) of cobalt oxide (CoO).
6. A method of manufacturing a colour display tube as claimed in Claim 1 in which the glass layer comprising the heavy metal is provided on the colour selection elec-trode in a stage of the manufacture, characterized in that a suspension comprising lead oxide and boric oxide is sprayed on the colour selection electrode while a sub-ambient pressure is maintained on the other side of the colour selection electrode after which the glass layer is formed during a thermal treatment.
7. A method as claimed in Claim 6, characterized in that the thermal treatment coincides with the stage of man-ufacturing the color display tube in which the display screen and the cone are sealed together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8400806A NL8400806A (en) | 1984-03-14 | 1984-03-14 | COLOR IMAGE TUBE. |
| NL8400806 | 1984-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1229121A true CA1229121A (en) | 1987-11-10 |
Family
ID=19843643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000478667A Expired CA1229121A (en) | 1984-03-14 | 1985-04-09 | Colour display tube |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US4784627A (en) |
| EP (1) | EP0156427B1 (en) |
| JP (1) | JPS60208026A (en) |
| CA (1) | CA1229121A (en) |
| DE (1) | DE3568382D1 (en) |
| NL (1) | NL8400806A (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6072143A (en) * | 1983-09-28 | 1985-04-24 | Toshiba Corp | Color picture tube |
| JPS61273835A (en) * | 1985-05-29 | 1986-12-04 | Mitsubishi Electric Corp | Manufacture of shadowmask |
| US4734615A (en) * | 1985-07-17 | 1988-03-29 | Kabushiki Kaisha Toshiba | Color cathode ray tube |
| GB8609695D0 (en) * | 1986-04-21 | 1986-05-29 | Philips Nv | Reducing doming in colour display tube |
| FR2638282B1 (en) * | 1988-10-25 | 1996-04-05 | Videocolor | MASK TUBE FOR VISUALIZATION, ESPECIALLY COLOR TELEVISION |
| US5451833A (en) * | 1993-10-28 | 1995-09-19 | Chunghwa Picture Tubes, Ltd. | Shadow mask damping for color CRT |
| CN1060584C (en) * | 1995-05-02 | 2001-01-10 | 中华映管股份有限公司 | Cathode-ray tube with shock-proof shadow mask |
| KR100373840B1 (en) * | 1995-11-08 | 2003-05-01 | 삼성에스디아이 주식회사 | Method of fabricating shadow mask for color picture tube |
| US6320306B1 (en) * | 1996-08-05 | 2001-11-20 | Samsung Display Devices Co., Ltd. | Shadow mask with porous insulating layer and heavy metal layer |
| DE19654613C2 (en) * | 1996-12-20 | 2001-07-19 | Samsung Display Devices Co Ltd | Shadow mask with insulation layer and process for its production |
| DE60206878T2 (en) * | 2001-01-30 | 2006-07-20 | Kabushiki Kaisha Toshiba | COLOR CATHODE RAY TUBES AND METHOD FOR THE PRODUCTION THEREOF |
| US6777861B2 (en) * | 2002-03-29 | 2004-08-17 | Sony Corporation | Color selector for emissive image display apparatus |
| US6861792B2 (en) | 2002-03-29 | 2005-03-01 | Sony Corporation | Color separator for emissive display |
| US6947198B2 (en) * | 2002-03-29 | 2005-09-20 | Sony Corporation | Emissive image display apparatus |
| US20030184531A1 (en) * | 2002-03-29 | 2003-10-02 | Sony Corporation | GLV engine for image display |
| US6788354B2 (en) | 2002-04-01 | 2004-09-07 | Sony Corporation | Method for making color separator for emissive display |
| US20050051950A1 (en) * | 2002-05-13 | 2005-03-10 | Greene David G.S. | Maze tag game |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3912482A (en) * | 1968-05-18 | 1975-10-14 | Philips Corp | Method of providing a sealed joint for joining parts of a vacuum vessel |
| US3668002A (en) * | 1968-07-01 | 1972-06-06 | Hitachi Ltd | Shadow mask having focusing function and method of making same |
| US3822454A (en) * | 1972-11-30 | 1974-07-09 | Gte Sylvania Inc | Method of fabricating a color cathode ray tube |
| US4339687A (en) * | 1980-05-29 | 1982-07-13 | General Electric Company | Shadow mask having a layer of high atomic number material on gun side |
| NL8004076A (en) * | 1980-07-16 | 1982-02-16 | Philips Nv | Colour TV tube with luminescent zones on screen - has shadow mask electrode coated with layer of lead deposited by galvanic process |
| DE3125075A1 (en) * | 1980-07-16 | 1982-03-11 | Naamloze Vennootschap Philips' Gloeilampenfabrieken, 5621 Eindhoven | "COLORED PIPES" |
| JPH0738295B2 (en) * | 1983-08-16 | 1995-04-26 | 株式会社東芝 | Color picture tube |
| US4671776A (en) * | 1983-09-13 | 1987-06-09 | Kabushiki Kaisha Toshiba | Manufacturing method of color picture tube |
| JPS6072143A (en) * | 1983-09-28 | 1985-04-24 | Toshiba Corp | Color picture tube |
| JPS60139379A (en) * | 1983-12-28 | 1985-07-24 | 柳下 相三郎 | Method and device for washing article |
-
1984
- 1984-03-14 NL NL8400806A patent/NL8400806A/en not_active Application Discontinuation
-
1985
- 1985-03-11 EP EP85200350A patent/EP0156427B1/en not_active Expired
- 1985-03-11 JP JP60046682A patent/JPS60208026A/en active Pending
- 1985-03-11 DE DE8585200350T patent/DE3568382D1/en not_active Expired
- 1985-04-09 CA CA000478667A patent/CA1229121A/en not_active Expired
-
1987
- 1987-08-31 US US07/091,467 patent/US4784627A/en not_active Expired - Lifetime
-
1988
- 1988-03-04 US US07/164,040 patent/US4931689A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0156427B1 (en) | 1989-02-22 |
| EP0156427A1 (en) | 1985-10-02 |
| US4931689A (en) | 1990-06-05 |
| NL8400806A (en) | 1985-10-01 |
| DE3568382D1 (en) | 1989-03-30 |
| JPS60208026A (en) | 1985-10-19 |
| US4784627A (en) | 1988-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |