US3899327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge carrier foil
Assignee: International Standard Electric Corp
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Filing: 1974-02-01
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Granted: 1975-08-12
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Expires: 1994-02-01
Abstract
Abstract This invention relates to a flexible foil having a nonconducting selenium layer and an intermediate layer between the foil and the selenium. The intermediate layer consists of polyvinyl acetal with an addition of carbon black. Before depositing the selenium layer, the intermediate layer is polished. This intermediate layer results in excellent adherence of the selenium onto the flexible foil which can be used in copying machines.
Inventors
- 👤 Karl Esser
- 👤 Robert Friedrich
- 👤 John E Segain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:56
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A CHARGE CARRIER FOIL COMPRISING: A FLEXIBLE CONDUCTING METAL FOIL, A CONDUCTING INTERMEDIATE LAYER ON SAID METAL FOIL, SAID INTERMEDIATE LAYER COMPRISING POLYVINYL ACETAL CONTAINING LAMPBLACK AS AN ADDITIVE, AND A NON-CONDUCTING SELENIUM LAYER ARRANGED ON SAID INTERMEDIATE LAYER.
Claim 2
Dependent Claim
39 words
A CHARGE CARRIER FOIL COMPRISING: A FLEXIBLE CONDUCTING METAL FOIL, A CONDUCTING INTERMEDIATE LAYER ON SAID METAL FOIL, SAID INTERMEDIATE LAYER COMPRISING POLYVINYL ACETAL CONTAINING LAMPBLACK AS AN ADDITIVE, AND A NON-CONDUCTING SELENIUM LAYER ARRANGED ON SAID INTERMEDIATE LAYER.
Claim 3
Dependent Claim
23 words
A charge carrier foil according to claim 1 wherein said intermediate layer has a thickness within the range of 1 to 2 microns.
Claim 4
Dependent Claim
21 words
A charge carrier foil according to claim 1 wherein 0.5 per cent by weight aRsenic is added to said selenium layer.
Claim 5
Dependent Claim
25 words
A charge carrier foil according to claim 1 wherein the surface of said intermediate layer is smoothed prior to the application of said selenium layer.
Claim 6
Dependent Claim
31 words
A charge carrier foil according to claim 4 wherein the amount of lampblack additive is chosen such that the intermediate layer conductance will have a value between 1 and 10 siemens.
Claim 7
Dependent Claim
18 words
A charge carrier foil according to claim 5 wherein the conductance of said intermediate layer is 1.5 siemens.
References Cited (Backward Citations)
US2962376A
Cited
US3226253A
Cited
US3467548A
Cited
US3639121A
Cited
US3775109A
Cited
US3615413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |