Patent US4423131A successfully refreshed from Google Patents.
US4423131A
Expired / Lapsed
US
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Photoresponsive devices containing polyvinylsilicate coatings
Assignee: Xerox Corp
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Filing: 1982-05-03
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Granted: 1983-12-27
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Expires: 2002-05-03
Abstract
Abstract This invention is directed to an improved photoresponsive device containing as a protectant overcoating a top layer of a crosslinked polyvinylsilicate resulting from the reaction of polysilicic acid with a polyvinyl alcohol having a number average molecular weight of from about 10,000 to about 100,000.
Inventors
- 👤 William W. Limburg
- 👤 John M. Pochan
- 👤 Charles L. Beatty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:37
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14791; G03G5/14717; G03G5/1473; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
An improved photoresponsive device consisting essentially of a supporting substrate, a photogenerating layer, a charge transport layer containing diamine molecules of the following formula, ##STR4## wherein X is ortho (CH 3 ), meta (CH 3 ), para (CH 3 ), ortho (Cl), meta (Cl), or para (Cl), and as a protective overcoating a top layer of a cross-linked polyvinylsilicate resulting from the reaction of polysilicic acid with a polyvinyl alcohol having a number average molecular weight of from about 10,000, to about 100,000.
Claim 2
Dependent Claim
83 words
An improved photoresponsive device consisting essentially of a supporting substrate, a photogenerating layer, a charge transport layer containing diamine molecules of the following formula, ##STR4## wherein X is ortho (CH 3 ), meta (CH 3 ), para (CH 3 ), ortho (Cl), meta (Cl), or para (Cl), and as a protective overcoating a top layer of a cross-linked polyvinylsilicate resulting from the reaction of polysilicic acid with a polyvinyl alcohol having a number average molecular weight of from about 10,000, to about 100,000.
Claim 3
Dependent Claim
24 words
An improved photoresponsive device in accordance with claim 1 wherein the photogenerating layer is situated between the protective overcoating and the charge transport layer.
Claim 4
Dependent Claim
24 words
An improved photoresponsive device in accordance with claim 1 wherein the photogenerating layer is situated between the supporting substrate and the charge transport layer.
Claim 5
Dependent Claim
39 words
An improved photoresponsive device in accordance with claim 1 wherein the photogenerating layer contains a photogenerating pigment dispersed in an inactive resinous binder, and wherein the charge transport layer is comprised of diamine molecules dispersed in a resinous binder.
Claim 6
Dependent Claim
37 words
An improved photoresponsive device in accordance with claim 1 wherein the polyvinyl alcohol is a copolymer containing about 87 to about 89 percent of vinyl alcohol, and from about 11 to about 13 percent of vinyl acetate.
Claim 7
Dependent Claim
27 words
An improved photoresponsive device in accordance with claim 1 wherein the polyvinylsilicate coating is present in a thickness of from about 0.1 micron to about 5 microns.
Claim 8
Dependent Claim
18 words
An improved photoresponsive device in accordance with claim 1 wherein the photoresponsive device is comprised of amphorous selenium.
Claim 9
Dependent Claim
18 words
An improved photoresponsive device in accordance with claim 1 wherein the photoresponsive device is comprised of selenium alloys.
Claim 10
Dependent Claim
21 words
An improved photoresponsive device in accordance with claim 8 wherein the selenium alloy contains selenium and arsenic, or selenium and tellurium.
Claim 11
Dependent Claim
19 words
An improved photoresponsive device in accordance with claim 1 wherein the photogenerating layer is vanadyl phthaloyanine, or trigonal selenium.
Claim 12
Dependent Claim
16 words
An improved photoresponsive device in accordance with claim 1 wherein the charge transport layer is N,N'-diphenyl-N,N'-bis(3-methylphenyl)[1,1'-biphenyl]-4,4'-diamine.
Claim 13
Dependent Claim
20 words
An improved photoresponsive device in accordance with claim 1 wherein the polyvinyl silicate polymer contains the following structural unit: ##STR5##
Claim 14
Dependent Claim
40 words
An improved photoresponsive device in accordance with claim 1 wherein the polyvinylsilicate polymer contains the following structural unit: ##STR6## wherein R is an aromatic group, a carbozole, an alkyl alkoxy, or halogen, X and Y are percentage numbers totalling 100.
Claim 15
Dependent Claim
20 words
An improved photoresponsive device in accordance with claim 13 wherein R is phenyl, X is 50 and Y is 50.
Claim 16
Dependent Claim
55 words
An improved photoresponsive device in accordance with claim 1 wherein the substrate has a thickness of from about 3 mils to about 10 mils, the generating layer has a thickness of from about 0.5 microns to about 10 microns, and the transport layer has a thickness of from about 5 microns to about 50 microns.
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |