US4916039A
Expired / Lapsed
US
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Electrophotographic photoconductor
Assignee: Ricoh Co Ltd
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Filing: 1988-07-08
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Granted: 1990-04-10
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Expires: 2008-07-08
Abstract
Abstract An electrophotographic photoconductor is disclosed which comprises an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer comprises as a charge generating material an azo pigment having general formula (I): ##STR1## wherein R 1 , R 2 , X, A and n are respectively defined in the specification.
Inventors
- 👤 Mitsuru Hashimoto
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:58
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683; C; C09; C09B; C09B35/00; C09B35/378; G03G5/0681; G03G5/0687; G03G5/0688; G03G5/069; G03G5/0692
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon, said photoconductive layer comprising as a charge generating material an azo pigment having general formula (I): ##STR91## wherein R 1 represents H, Cl, CH 3 , or OCH 3 ; R 2 represents H, Cl, or CH 3 , provided that R 1 and R 2 may not be hydrogen at the same time; A represents ##STR92## wherein R 3 represents a lower alkyl group or a nitro group; R 4 represents a lower alkyl group, a lower alkoxyl group or Cl; R 5 represents a lower alkyl group, a lower alkoxyl group, Cl or a nitro group; and R 6 and R 7 each represent a lower alkyl group or Cl; and X represents ##STR93##
Claim 2
Dependent Claim
129 words
An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon, said photoconductive layer comprising as a charge generating material an azo pigment having general formula (I): ##STR91## wherein R 1 represents H, Cl, CH 3 , or OCH 3 ; R 2 represents H, Cl, or CH 3 , provided that R 1 and R 2 may not be hydrogen at the same time; A represents ##STR92## wherein R 3 represents a lower alkyl group or a nitro group; R 4 represents a lower alkyl group, a lower alkoxyl group or Cl; R 5 represents a lower alkyl group, a lower alkoxyl group, Cl or a nitro group; and R 6 and R 7 each represent a lower alkyl group or Cl; and X represents ##STR93##
Claim 3
Dependent Claim
47 words
The electrophotographic photoconductor as claimed in claim 1 wherein, in general formula (I), R 1 is H or Cl; R 2 is H, Cl or CH 3 , provided that R 1 and R 2 may not be hydrogen at the same time; and A is ##STR94##
Claim 4
Dependent Claim
34 words
An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon, said photoconductive layer comprising as a charge generating material an azo pigment having general formula (II): ##STR95## wherein A represent ##STR96##
Claim 5
Dependent Claim
34 words
An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon, said photoconductive layer comprising as a charge generating material an azo pigment having general formula (II): ##STR95## wherein A represent ##STR96##
Claim 6
Dependent Claim
40 words
The electrophotographic photoconductor as claimed in claim 1, wherein said photoconductive layer comprises a charge generation layer and a charge transport layer which are overlaid on said electroconductive support, and said azo pigment is contained in said charge generation layer.
Claim 7
Dependent Claim
40 words
The electrophotographic photoconductor as claimed in claim 3, wherein said photoconductive layer comprises a charge generation layer and a charge transport layer which are overlaid on said electroconductive support, and said azo pigment is contained in said charge generation layer.
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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |