Patent US3839033A successfully refreshed from Google Patents.
US3839033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive member containing a nitrocellulose-polyvinyl pyrrolidone barrier layer
Assignee: Canon Inc
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Filing: 1972-06-19
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Granted: 1974-10-01
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Expires: 1992-06-19
Abstract
Abstract An electrophotographic photosensitive member comprises a support, a barrier layer overlying the support, the barrier layer comprising a composite of nitrocellulose and polyvinylpyrrolidone, and an organic photoconductive layer overlying the barrier.
Inventors
- 👤 H Matsuno
- 👤 I Endo
- 👤 K Suzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:36
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER WHICH COMPRISES AN ELECTRICALLY CONDUCTIVE SUPPORT, A BARRIER LAYER OVERLYING THE ELECTRICALLY CONDUCTIVE SUPPORT, THE BARRIER LAYER COMPRISING A BLEND OF NITROCELLULOSE AND POLYVINYLPYRROLIDONE IS IN WJIHICH THE RATIO OF NITROCELLULOSE TO POLYVINYLPYRROLIDONE IS IN THE RANGE OF 2:8 TO 8:2, BY WEIGHT, AND HAVING A THICKNESS OF 1 TO 10 MICRONS AND AN ORGANIC PHOTOCONDUCTIVE LAYER OVERLYING THE BARRIER LAYER.
Claim 2
Dependent Claim
65 words
AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER WHICH COMPRISES AN ELECTRICALLY CONDUCTIVE SUPPORT, A BARRIER LAYER OVERLYING THE ELECTRICALLY CONDUCTIVE SUPPORT, THE BARRIER LAYER COMPRISING A BLEND OF NITROCELLULOSE AND POLYVINYLPYRROLIDONE IS IN WJIHICH THE RATIO OF NITROCELLULOSE TO POLYVINYLPYRROLIDONE IS IN THE RANGE OF 2:8 TO 8:2, BY WEIGHT, AND HAVING A THICKNESS OF 1 TO 10 MICRONS AND AN ORGANIC PHOTOCONDUCTIVE LAYER OVERLYING THE BARRIER LAYER.
Claim 3
Dependent Claim
21 words
An electrophotographic photosensitive member according to claim 1 in which the organic photoconductive layer is composed of organic polymeric photoconductive material.
Claim 4
Dependent Claim
35 words
An electrophotographic photosensitive member according to claim 2 in which the organic polymeric photoconductive material is an organic photoconductive material selected from the group consisting of poly-N-vinylcarbazole, chlorinated poly-N-vinylcarbazole, brominated poly-N-vinylcarbazole, cyanated poly-N-vinyl-carbazole, and polyvinylacenaphthene.
References Cited (Backward Citations)
US3428451A
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US3468660A
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US3245833A
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GB1153506A
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US3649336A
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US3615403A
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US3652268A
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US3640708A
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |