Patent US3778263A successfully refreshed from Google Patents.
US3778263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc oxide photoconductive element with starch reaction product interlayer
Assignee: Ricoh Co Ltd
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Filing: 1972-06-19
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Granted: 1973-12-11
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Expires: 1992-06-19
Abstract
Abstract An electrophotographic copying material having a photoconductive layer formed on the surface of a support, whose back is precoated with an electroconductive layer, with an intermediary layer between said photoconductive layer and the support, said intermediary layer comprising a printing-durable polymer consisting of methylol starch or a mixture of methylol starch and vinyl polymer.
Inventors
- 👤 F Arai
- 👤 T Tanaka
- 👤 N Usui
- 👤 S Shimizu
- 👤 W Ohta
- 👤 J Kurokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:33
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G13/00; G03G13/26; G03G13/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
An electrophotographic copying material as claimed in claim 1, in which said intermediate layer (b) contains from 10 to 100 parts by weight of vinyl polymer per 100 parts by weight of said reaction product (a).
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |