US4135928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic light-sensitive member
Assignee: Ricoh Co Ltd
•
Filing: 1977-10-17
•
Granted: 1979-01-23
•
Expires: 1997-10-17
Abstract
Abstract Electrophotographic light-sensitive member carrying a layer on an electroconductive support, said layer comprising a charge generating substance, a binder and 7-nitro-2-aza-9-fluorenylidene-malonitrile.
Inventors
- 👤 Mitsuru Hashimoto
- 👤 Masafumi Ohta
- 👤 Akio Kozima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0635; G03G5/0637
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
An electrophotographic light-sensitive member comprising an electroconductive support, a layer on said electroconductive support, said layer comprising a charge generating substance, a binder and 7-nitro-2-aza-9-fluorenylidene-malonitrile having the following formula: ##STR2##
Claim 2
Dependent Claim
30 words
An electrophotographic light-sensitive member comprising an electroconductive support, a layer on said electroconductive support, said layer comprising a charge generating substance, a binder and 7-nitro-2-aza-9-fluorenylidene-malonitrile having the following formula: ##STR2##
Claim 3
Dependent Claim
42 words
An electrophotographic light-sensitve member comprising an electroconductive support, a first layer on said support, said first layer comprising a charge generating substance, a second layer on said first layer, said second layer comprising a binder and 7-nitro-2-aza-9-fluorenylidene-malonitrile having the following formula: ##STR3##
Claim 4
Dependent Claim
42 words
An electrophotographic light-sensitve member comprising an electroconductive support, a first layer on said support, said first layer comprising a charge generating substance, a second layer on said first layer, said second layer comprising a binder and 7-nitro-2-aza-9-fluorenylidene-malonitrile having the following formula: ##STR3##
Claim 5
Dependent Claim
48 words
An electrophotographic light-sensitive member according to claim 1 or 2 wherein said charge generating substance is at least one substance selected from the group consisting of selenium, Se-Te alloy, CdS, CdS-Se, azo-type pigments, xanthene-type pigments, phthalocyanine-type pigments, indigo-type pigments, perylene-type pigments, indigoid-type pigments, bis-benzimidazole-type pigments and polynuclear quinone.
Claim 6
Dependent Claim
49 words
An electrophotographic light-sensitive member according to claim 1 or 2 wherein said binder is at least one binder selected from the group consisting of polyamide, polyester, polyurethane, polystyrene, polycarbonate, polyvinyl formal, polyvinyl acetal, polyvinyl butyral, ethyl cellulose, nitrocellulose, acetylcellulose, epoxy resin, alkyd resin, acrylic resin, silicone resin and poly-N-vinylcarbazole.
Claim 7
Dependent Claim
54 words
An electrophotographic light-sensitive member according to claim 1 or 2 wherein a layer of resin selected from the group consisting of polyamide, polyvinyl acetate and polyurethane or a layer of aluminum oxide having a thickness of 0.01 to 1 μ is located between said electroconductive support and the layer containing said charge generating substance.
References Cited (Backward Citations)
US3121006A
Cited
GB1337228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |