US3901783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing selenium charge electrophotographic recording plates
Assignee: International Standard Electric Corp
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Filing: 1974-02-05
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Granted: 1975-08-26
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Expires: 1994-02-05
Abstract
Abstract This relates to a method of producing an electrophotographic recording plate having a non-conducting selenium layer. A small portion of semiconducting material, especially chemical compounds of cadmium, zinc or titanium, is sputtered onto the selenium surface in a glow discharge.
Inventors
- 👤 Helmut Raum
- 👤 John E Segain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:56
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A METHOD OF PREPARING A SELENIUM CHARGE ELECTROPHOTOGRAPHIC RECORDING PLATE HAVING A SELENIUM LAYER DEPOSITED ON A METAL SUBSTRATE COMPRISING THE STEPS OF: DEPOSITING SELENIUM ON A METAL SUBSTRATE BY EVAPORATION UNDER VACUUM TO FORM SELENIUM LAYER, DEPOSITING A THIN COATING OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF CADMIUM SULFIDE, ZINC OXIDE AND ZINC SULFIDE ON A METAL PLATE, THEREAFTER SPUTTERING A PORTION OF SAID SEMICONDUCTING MATERIAL ON SAID SELENIUM LAYER BY SUBJECTING THE SELENIUM COATED METAL SUBSTRATE AND SAID METAL PLATE TO A GLOW DISCHARGE.
Claim 2
Independent Claim
89 words
A METHOD OF PREPARING A SELENIUM CHARGE ELECTROPHOTOGRAPHIC RECORDING PLATE HAVING A SELENIUM LAYER DEPOSITED ON A METAL SUBSTRATE COMPRISING THE STEPS OF: DEPOSITING SELENIUM ON A METAL SUBSTRATE BY EVAPORATION UNDER VACUUM TO FORM SELENIUM LAYER, DEPOSITING A THIN COATING OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF CADMIUM SULFIDE, ZINC OXIDE AND ZINC SULFIDE ON A METAL PLATE, THEREAFTER SPUTTERING A PORTION OF SAID SEMICONDUCTING MATERIAL ON SAID SELENIUM LAYER BY SUBJECTING THE SELENIUM COATED METAL SUBSTRATE AND SAID METAL PLATE TO A GLOW DISCHARGE.
Claim 3
Dependent Claim
45 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said glow discharge is carried out under a pressure within the range of 10 1 to 10 2 torr at a voltage within the range of 800 to 2,000 volts.
Claim 4
Dependent Claim
33 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 2, wherein said glow discharge is carried out for a period of time ranging between 30 seconds to 60 minutes.
Claim 5
Dependent Claim
24 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said metal plate has a pattern of recesses thereon.
Claim 6
Dependent Claim
27 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said metal plate used as the cathode is a perforated metal plate.
Claim 7
Dependent Claim
26 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said glow discharge is carried out in an inert gas atmosphere.
Claim 8
Dependent Claim
23 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said glow discharge is carried out in nitrogen.
Claim 9
Dependent Claim
23 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said glow discharge is carried out in oxygen.
Claim 10
Dependent Claim
24 words
A method of preparing a selenium charge electrophotographic recording plate according to claim 1, wherein said metal plate is a polished plate of aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |