Patent US3778264A successfully refreshed from Google Patents.
US3778264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc oxide photoconductive element with an epoxy group containing interlayer
Assignee: Ricoh Co Ltd
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Filing: 1972-06-26
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Granted: 1973-12-11
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Expires: 1992-06-26
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 the reaction product of (A) a polymer having epoxy groups and (B) at least one member selected from the bridgemaking agent group consisting of water-soluble amino resin, amino compound, dibasic acid and acid anhydride.
Inventors
- 👤 F Arai
- 👤 N Usui
- 👤 S Shimizu
- 👤 W Ohta
- 👤 J Kurokawa
- 👤 T Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G13/00; G03G13/26; G03G13/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
An electrophotographic copying material as claimed in claim 1, in which said intermediate layer contains from 0.001 to 0.2 parts by weight of bridge-making agent per one part by weight of said polymer.
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 |