Patent US665942A successfully refreshed from Google Patents.
Patent US3761259A successfully refreshed from Google Patents.
US3761259A
Expired / Lapsed
US
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Electrophotographic element containing an intermediate layer
Assignee: Ricoh Co Ltd
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Filing: 1972-07-05
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Granted: 1973-09-25
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Expires: 1992-07-05
Abstract
Abstract AN ELECTROPHOTOGRAPHIC COPYING MATERIAL HAVING A PHOTOCONDUCTIVE LAYER FORMED ON THE SURFACE OF A SUPPORT, WHOSE BACK IS PRE-COATED 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) AT LEAST ONE MEMBER OF FILM FORMING AND WATER SOLUBLE HIGH MOLECULAR WEIGHT SUBSTANCES, (B) AT LEAST ONE MEMBER OF ETHYLENE-TYPE VINYL RESINS, AND (C) N-METHYLOL ACRYLAMIDE.
Inventors
- 👤 F Arai
- 👤 W Ohta
- 👤 J Kurokawa
- 👤 T Tanaka
- 👤 N Usui
- 👤 S Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:51
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G5/00; G03G5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |