Patent US4419429A successfully refreshed from Google Patents.
US4419429A
Expired / Lapsed
US
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Sensitized electrophotographic photosensitive composition
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1982-02-08
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Granted: 1983-12-06
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Expires: 2002-02-08
Abstract
Abstract Disclosed is an electrophotographic photosensitive composition which comprises a phthalocyanine type photoconductor dispersed in an electrically insulating resin medium, wherein a nitrophthalic anhydride represented by the following formula: ##STR1## wherein n is a number of 1 or 2, is incorporated as a sensitizer.
Inventors
- 👤 Toru Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:50
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0696; G03G5/0601; G03G5/0618
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A photosensitive composition for electrophotography which consists essentially of (A) a phthalocyanine photoconductor, (B) 4-nitrophthalic anhydride as a sensitizer, and (C) an electrically insulating, electrophotographically inactive resin binder having a volume resistivity of at least 1×10 14 Ω-cm, the sensitizer (B) being present in an amount of 1 to 200 parts by weight per 100 parts by weight of the photoconductor (A), and the photoconductor (A) and the binder (C) being present at a weight ratio of from 1/20 to 1/1.
Claim 2
Dependent Claim
81 words
A photosensitive composition for electrophotography which consists essentially of (A) a phthalocyanine photoconductor, (B) 4-nitrophthalic anhydride as a sensitizer, and (C) an electrically insulating, electrophotographically inactive resin binder having a volume resistivity of at least 1×10 14 Ω-cm, the sensitizer (B) being present in an amount of 1 to 200 parts by weight per 100 parts by weight of the photoconductor (A), and the photoconductor (A) and the binder (C) being present at a weight ratio of from 1/20 to 1/1.
Claim 3
Dependent Claim
52 words
A composition as set forth in claim 1 wherein the sensitizer (B) is present in an amount of 10 to 150 parts by weight, per 100 parts by weight of the photoconductor (A), and the photoconductor (A) and the binder (C) are present at a weight ratio of from 1/10 to 1/2..
Claim 4
Dependent Claim
20 words
A composition as set forth in claim 1 wherein the phthalocyanine photoconductor is a metal-free phthalocyanine or its nucleus-substituted derivative.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |