US3595648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly-n-vinyl-3-nitro carbazole photoconductive material
Assignee: Ricoh Co Ltd
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Filing: 1968-03-13
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Granted: 1971-07-27
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Expires: 1988-03-13
Abstract
Abstract AN ORGANIC PHOTOCONDUCTIVE MATERIAL FOR USE IN ELECTROPHOTOGRAPHIC COPYING PAPER, SAID MATERIAL CONSISTING ESSENTIALLY OF POLY-N-VINYL-3-NITROSOCARBAZOLE WHICH IS QUITE EASILY SYNTHESIZED BY INTRODUCING A NITROSO RADICAL INTO POLY-N-VINYL CARBAZOLE, AND ALSO AN ELECTROPHOTOGRAPHIC COPYING PAPER PREPARED WITH A SUPPORT PAPER AND A LIGHTSENSITIVE LAYER WHICH IS FORMED WITH THE AFORESAID ORGANIC PHOTOCONDUCTIVE MATERIAL ON ONE SURFACE OF SAID SUPPORT PAPER.
Inventors
- 👤 Kazuo Tubuko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; G03G5/072; G03G5/073; C; C08; C08F; C08F8/00
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |