Patent US3925571A successfully refreshed from Google Patents.
US3925571A
Expired / Lapsed
US
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Method of making a selenium charge carrier plate
Assignee: International Standard Electric Corp
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Filing: 1974-02-01
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Granted: 1975-12-09
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Expires: 1994-02-01
Abstract
Abstract In a method for producing a charge carrier plate or foil having a non-conducting selenium layer for xerography, the selenium is deposited onto a carrier plate by evaporation in vacuum with a deposition rate of about 0.5 microns per minute.
Inventors
- 👤 Karl Esser
- 👤 John E Segain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
AN IMPROVED METHOD OF PREPARING A SEALENIUM CHARGE CARRIER FOIL FOR USE IN A COPYING MACHINE WHEREIN A NON-CONDUCTING LAYER OF SELENIUM IS E VAPORATED ONTO A METAL SUBSTRATE WHEREIN THE IMPROVEMENT COMPRISES: SPRAYING A LAYER OF CONDUCTIVE LACQUER ONTO A FLEXIBLE CHARGE CARRIER METAL FOIL; AND EVAPORATING A NON-CONDUCTING LAYER OF SELENIUM ONTO SAID LAYER OF CONDUCTIVE LACQUER AT A DEPOSITION RATE OF APPROXIMATELY 0.5 MICRONS PER MINUTE.
Claim 2
Dependent Claim
69 words
AN IMPROVED METHOD OF PREPARING A SEALENIUM CHARGE CARRIER FOIL FOR USE IN A COPYING MACHINE WHEREIN A NON-CONDUCTING LAYER OF SELENIUM IS E VAPORATED ONTO A METAL SUBSTRATE WHEREIN THE IMPROVEMENT COMPRISES: SPRAYING A LAYER OF CONDUCTIVE LACQUER ONTO A FLEXIBLE CHARGE CARRIER METAL FOIL; AND EVAPORATING A NON-CONDUCTING LAYER OF SELENIUM ONTO SAID LAYER OF CONDUCTIVE LACQUER AT A DEPOSITION RATE OF APPROXIMATELY 0.5 MICRONS PER MINUTE.
Claim 3
Dependent Claim
29 words
An improved method of preparing a selenium charge carrier foil according to claim 1, wherein said selenium is evaporated under a pressure less than 10 4 torr (mm Hg).
Claim 4
Dependent Claim
28 words
An improved method of preparing a selenium charge carrier foil according to claim 1, wherein said metal substrate is kept at a temperature of substantially 60*C during evaporation.
Claim 5
Dependent Claim
23 words
An improved method of preparing a selenium charge carrier foil according to claim 1, wherein said selenium layer is approximately 60 microns thick.
Claim 6
Dependent Claim
34 words
An improved method of preparing a selenium charge carrier foil according to claim 1, wherein said layer of conducting lacquer consists of polyvinylacetal as a base material containing the additive lampblack for increasing conductivity.
Claim 7
Dependent Claim
26 words
An improved method of preparing a selenium charge carrier foil according to claim 1, wherein said metal foil has a thickness of 1 to 2 microns.
Claim 8
Dependent Claim
23 words
An improved method of preparing a selenium charge carrier foil according to claim 6, further including the step of tempering the coated foil.
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |