Patent US5307349A successfully refreshed from Google Patents.
Patent US3871883A successfully refreshed from Google Patents.
US3871883A
Expired / Lapsed
US
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Electrophotographic photoconductive layer comprising an organic photoconductor and a dicyanomethylene-indenothiophene sensitizer
Assignee: Ricoh Co Ltd
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Filing: 1973-12-19
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Granted: 1975-03-18
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Expires: 1993-12-19
Abstract
Abstract Electrophotographic light-sensitive materials having a photoconductive layer formed on an electroconductive support, the photoconductive layer comprising an organic photoconductive compound (monomer or polymer) and 4-dicyanomethylene-4Hindeno(1,2-b)thiophene or 8-dicyanomethylene-8H-indeno(2,1b)thiophene or their derivatives as sensitizers, and processes for preparing such compounds from 4H-indeno(1,2-b)thiophene-4-one or 8H-indeno(2,1-b)thiophen-8-one or their derivatives and malonitrile.
Inventors
- 👤 Mitsuru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:32
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/24; C07D333/50; C07D333/78; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
AN ELECTROPHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL HAVING A PHOTOCONDUCTIVE LAYER FORMED ON AN ELECTROCONDUCTIVE SUPPORT, THE PHOTOCONDUCTIVE LAYER COMPRISING AN ORGANIC PHOTOCONDUCTIVE MONOMER OR AN ORGANIC PHOTOCONDUCTIVE POLYMER, AND A SENSITIZING COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
33 words
AN ELECTROPHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL HAVING A PHOTOCONDUCTIVE LAYER FORMED ON AN ELECTROCONDUCTIVE SUPPORT, THE PHOTOCONDUCTIVE LAYER COMPRISING AN ORGANIC PHOTOCONDUCTIVE MONOMER OR AN ORGANIC PHOTOCONDUCTIVE POLYMER, AND A SENSITIZING COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
14 words
An electrophotographic light-sensitive material according to claim 1 wherein the sensitizing compound is 6,8-dinitro-4-dicyanomethylene-4H-indeno(1,2-b)thiophene.
Claim 4
Dependent Claim
14 words
An electrophotographic light-sensitive material according to claim 1 wherein the sensitizing compoUnd is 2,6,8-trinitro-4-dicyanomethylene-4H-indeno(1,2-b)-thiophene.
Claim 5
Dependent Claim
14 words
An electrophotographic light-sensitive material according to claim 1 wherein the sensitizing compound is 2,6-dinitro-8-dicyanomethylene-8H-indeno(2,1-b)thiophene.
Claim 6
Dependent Claim
14 words
An electrophotographic light-sensitive material according to claim 1 wherein the sensitizing compound is 2,4,6-trinitro-8-dicyanomethylene-8H-indeno(2,1-b)thiophene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |