Patent US3583869A successfully refreshed from Google Patents.
US3583869A
Expired / Lapsed
US
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Electrophotographic copying paper containing poly-n-vinyl-3-azo carbazole
Assignee: Ricoh Co Ltd
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Filing: 1968-03-18
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Granted: 1971-06-08
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Expires: 1988-03-18
Abstract
Abstract POLY-N-VINYL-3-AZO CARBAZOLE WHICH IS OBTAINED BY THE COUPLING BETWEEN POLY-N-VINYL CARBAZOLE AND A DIAZO COMPOUND SELECTED AS DESIRED FROM VARIOUS DIAZO COMPOUNDS IS EXTREMELY SUITABLE AS A PHOTOCONDUCTIVE MATERIAL FOR USE IN ELECTROPHOTOGRAPHIC COPYING PAPERS. AN ELECTROPHOTOGRAPHIC COPYING PAPER WHICH IS PREPARED BY COATING THIS POLY-N-VINYL-3-AZO CARBAZOLE ON A SUPPORT PAPER SHEET WHICH TRANSMITS ULTRAVIOLET RAYS THERETHROUGH CAN BE UTILIZED AS THE MATERIAL FOR PREPARING A SECOND ORIGINAL FOR THE COPYING PROCESS WHICH USES DIAZOTYPE COPYING PAPERS.
Inventors
- 👤 Kazuo Tubuko
- 👤 Tetsuo Tanaka
- 👤 Nario Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:03
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; G03G5/072; G03G5/073; Y; Y10; Y10S; Y10S534/00; Y10S534/03
Claims Analysis
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |