US3775109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive plate
Assignee: Ricoh Co Ltd
•
Filing: 1970-05-20
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Granted: 1973-11-27
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Expires: 1990-05-20
Abstract
Abstract An electrophotographic photosensitive plate is provided consisting of a conductive substrate support, a first thin film or layer of gold, platinum or selenium deposited on said support and a second photoconductive insulating film or layer of selenium deposited on said first layer. The second film or layer consisting essentially of selenium is deposited at a temperature in the range about 20*C - 40*C. The gold or platinum of said first film can be deposited by vacuum deposition or plating on said support and the selenium of said first film is deposited at a temperature in the range about 60*C - 75*C. The resulting plate when employed in a repetitive electrostatic copying operation exhibits almost negligible residual potential.
Inventors
- 👤 W Ohta
- 👤 K Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G5/144; G03G5/02; G03G5/04; G03G5/043; G03G5/0433; G03G5/08; G03G5/082; G03G5/08207
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
13 words
A plate in accordance with claim 1 wherein said first film is gold.
Claim 2
Dependent Claim
13 words
A plate in accordance with claim 1 wherein said first film is platinum.
Claim 3
Dependent Claim
27 words
A plate in accordance with claim 1 wherein said first film is selenium deposited on said support at a temperature in the range about 60* - 75*C.
Claim 4
Dependent Claim
23 words
A plate in accordance with claim 1 wherein said support is provided by a smooth or polished surface of an electrically conductive material.
Claim 5
Dependent Claim
23 words
A plate in accordance with claim 1 wherein said support is provided by a smooth or polished surface of an electrically conductive metal.
Claim 6
Dependent Claim
22 words
A plate in accordance with claim 6 wherein said electrically conductive metal is selected from the group consisting of aluminum and copper.
Claim 7
Dependent Claim
23 words
A plate in accordance with claim 1 wherein said first film has a thickness in the range from about 50A to about 250A.
Claim 8
Dependent Claim
18 words
A plate in accordance with claim 1 wherein said second film has a thickness of about 50-100 microns.
Claim 9
Dependent Claim
21 words
A plate in accordance with claim 1 wherein said second film is amorphous selenium having a thickness of about 70 microns.
Claim 10
Dependent Claim
59 words
A plate in accordance with claim 1 wherein said support is a metal selected from the group consisting of aluminum and copper, said first film has a thickness in the range from about 50A to about 2 microns and said second film of selenium is a film of amorphous selenium having a thickness in the range of 50-100 microns.
Claim 11
Dependent Claim
20 words
A plate in accordance with claim 11 wherein said film of amorphous selenium has a thickness of about 70 microns.
Claim 12
Dependent Claim
57 words
A plate in accordance with claim 1 wherein said first film is a selenium film deposited on said support at a temperature in the range from about 60*C to about 75*C and having a thickness of about 2 microns and wherein said second film is a film of amorphous selenium having a thickness of about 70 microns.
Claim 13
Dependent Claim
25 words
A plate in accordance with claim 1 wherein said first film is gold having a thickness in the range from about 50A to about 250A.
Claim 14
Dependent Claim
25 words
A plate in accordance with claim 1 wherein said first film is platinum having a thickness in the range from about 50A to about 250A.
Claim 15
Dependent Claim
45 words
A plate in accordance with claim 1 wherein said first film is a selenium film deposited on said support which said support was at a temperature in the range about 60-75*C and wherein said selenium film has a thickness in the range about 0.5-5.0 microns.
Claim 16
Dependent Claim
74 words
In a method for the production of electrophotographic photosensitive plates comprising a conductive support and a photoconductive layer, the improvement which comprises forming the photoconductive layer by first depositing a first film of metal selected from the group consisting of gold, platinum and selenium on said support, and, thereafter, depositing a second film of selenium while maintaining the temperature of the first film coated support at a temperature in the range from 20*C. -40*C.
References Cited (Backward Citations)
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US2970906A
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US3056136A
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US2962376A
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US3174855A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |