Patent US4013464A successfully refreshed from Google Patents.
US4013464A
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Photoconductive and radioconductive compositions and elements containing tetragonal lead monoxide
Assignee: Eastman Kodak Co
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Filing: 1975-12-03
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Granted: 1977-03-22
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Expires: 1995-12-03
Abstract
Abstract Photoconductive and radioconductive insulating compositions of desirably low dark conductivity and improved resistance to fatigue include tetragonal lead oxide, a binder of polyvinylacetate, polyvinylformal and/or polyvinylbutyral and a small effective amount of an anhydride capable of inhibiting dark conductivity in the composition, particularly under repeated use. Preferred anhydrides are phthalic and maleic anhydrides in an amount of less than about 4 percent of the weight of lead oxide in the composition. Such compositions can be carried on an electrically conductive support to provide elements that are useful for electrophotographic and electroradiographic imaging.
Inventors
- 👤 William A. Light
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G5/05; G03G5/0503; G03G5/051; G03G5/0521
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and an anhydride capable of inhibiting dark conductivity in the composition, said anhydride present in effective amount less than about 4 percent of the weight of the lead oxide in the composition.
Claim 2
Dependent Claim
54 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and an anhydride capable of inhibiting dark conductivity in the composition, said anhydride present in effective amount less than about 4 percent of the weight of the lead oxide in the composition.
Claim 3
Dependent Claim
67 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride capable of inhibiting dark conductivity within the element and being an anhydride derived from an α,β-dicarboxyl substituted compound or an α-carboxyl-β-hydroxy substituted compound.
Claim 4
Dependent Claim
67 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride capable of inhibiting dark conductivity within the element and being an anhydride derived from an α,β-dicarboxyl substituted compound or an α-carboxyl-β-hydroxy substituted compound.
Claim 5
Dependent Claim
20 words
A photoconductive and radioconductive insulating composition as described in claim 2 wherein the anhydride is derived from an α,β-dicarboxylic acid.
Claim 6
Dependent Claim
63 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutryal and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride selected from the group consisting of maleic anhydride, phthalic anhydride, tetrabromophthalic anhydride, 3-nitrophthalic anhydride, naphthalic anhydride and 3,3',4,4'-benzophenonetetracarboxylic dianhydride.
Claim 7
Dependent Claim
63 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutryal and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride selected from the group consisting of maleic anhydride, phthalic anhydride, tetrabromophthalic anhydride, 3-nitrophthalic anhydride, naphthalic anhydride and 3,3',4,4'-benzophenonetetracarboxylic dianhydride.
Claim 8
Dependent Claim
57 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride selected from the group consisting of a phthalic anhydride and a maleic anhydride.
Claim 9
Dependent Claim
57 words
A photoconductive and radioconductive insulating composition comprising tetragonal lead monoxide, a binder selected from the group consisting of polyvinylacetate, polyvinylformal and polyvinylbutyral and, in an amount that ranges from about 0.5 to about 4 percent of the weight of the lead oxide, an anhydride selected from the group consisting of a phthalic anhydride and a maleic anhydride.
Claim 10
Dependent Claim
23 words
An electrophotographic and electroradiographic element comprising an electrically conducting support having thereon a photo- and radioconductive insulating composition as described in claim 1.
Claim 11
Dependent Claim
23 words
An electrophotographic and electroradiographic element comprising an electrically conducting support having thereon a photo- and radioconductive insulating composition as described in claim 2.
Claim 12
Dependent Claim
23 words
An electrophotographic and electroradiographic element comprising an electrically conducting support having thereon a photo- and radioconductive insulating composition as described in claim 4.
Claim 13
Dependent Claim
23 words
An electrophotographic and electroradiographic element comprising an electrically conducting support having thereon a photo- and radioconductive insulating composition as described in claim 5.
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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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |