Patent US3787207A successfully refreshed from Google Patents.
US3787207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive plate having a polyimide intermediate layer
Assignee: Panasonic Holdings Corp
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Filing: 1971-12-16
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Granted: 1974-01-22
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Expires: 1991-12-16
Abstract
Abstract This invention provides an improved electrophotographic photosensitive plate with excellent durability and electrophotographic characteristics. The plate comprises a multilayered electrophotographic photosensitive plate comprising, from the top, a first layer including an organic photoconductive insulating material, a second layer including vitreous selenium, a third layer including a polyimide material and the fourth layer of an electrically conductive backing.
Inventors
- 👤 M Hasegawa
- 👤 Y Hayashi
- 👤 T Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:34
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0436; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
A multilayered electrophotographic photosensitive plate, defined by claim 1, wherein said polyimide material has the following chemical formula:
Claim 2
Dependent Claim
18 words
A multilayered electrophotographic photosensitive plate defined by claim 1, wherein said polyimide material has the following chemical formula:
Claim 3
Dependent Claim
26 words
A multilayered electrophotographic photosensitive plate defined by claim 1, wherein said third layer, including polyimide material, has a thickness range of 2 to 8 microns inclusive.
References Cited (Backward Citations)
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US3700497A
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US3595649A
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US3639122A
Cited
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |