US3721552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic reproduction material
Assignee: GAF Corp
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Filing: 1971-07-22
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Granted: 1973-03-20
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Expires: 1991-07-22
Abstract
Abstract Photoconductive compositions containing a resin and as a photoconductor, a 2-tricyanovinyl-pyrrol, a 3-tricyanovinylindole or a tricyano-vinyl-benzene which may have an amino or hydroxy group in 4-position, optionally including an optical sensitizer, and electrophotographic reproduction materials having a layer of said composition adhering to a substrate.
Inventors
- 👤 J Tellier
- 👤 Boer H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:21
CPC Classifications
C; C07; C07C; C07C255/00; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0612; G03G5/0614; G03G5/06142; G03G5/06147; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
38 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the H-atom linked to the nitrogen atom of the pyrrole or indole nucleus is substituted by an alkyl group having from one to five carbon atoms inclusive.
Claim 2
Dependent Claim
24 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the alkyl group is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl or tertiary butyl.
Claim 3
Dependent Claim
28 words
A material for electrophotographic reproduction as clAimed in claim 1, wherein the amino group is substituted by an alkyl group having from one to five carbon atoms inclusive.
Claim 4
Dependent Claim
22 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the photoconductive substance is 3-(tricyanovinyl)-indole or an N-alkyl substituted derivative thereof.
Claim 5
Dependent Claim
22 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the photoconductive substance is 2-(tricyanovinyl)-N-pyrrole or an N-alkyl substituted derivative thereof.
Claim 6
Dependent Claim
17 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the photoconductive substance is 4-tricyanovinyl-2,6-dimethyl phenol.
Claim 7
Dependent Claim
18 words
A material for electrophotographic reproduction as claimed in claim 1, where the photoconductive substance is 4-tricyanovinyl-N,N-dimethyl- or diethyl-aniline.
Claim 8
Dependent Claim
30 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the ratio by weight of the tricyanovinyl compound to the resin binder is within the range 10:1 to 1:10.
Claim 9
Dependent Claim
18 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the photoconductive layer includes an optical sensitizer.
Claim 10
Dependent Claim
18 words
A material for electrophotographic reproduction as claimed in claim 10, wherein the sensitizer is a phenol sulphone phthalein.
Claim 11
Dependent Claim
32 words
A material for electrophotographic reproduction as claimed in claim 10, wherein the optical sensitizer is present in a quantity of up to 3 percent based on the weight of the photoconductive layer.
Claim 12
Dependent Claim
34 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the coating weight of the photoconductive insulating layer lies between 1 and 50 grams per square meter of the surface of the substrate.
Claim 13
Dependent Claim
17 words
A material for electrophotographic reproduction as claimed in claim 1, wherein the substrate is an aluminum foil.
Claim 14
Dependent Claim
60 words
A photoconductive composition comprising a resin and a photoconductive substance comprising at least one compound having the general formula: wherein A represents a radical selected from the group consisting of phenyl, 4-hydroxyphenyl, 4-aminophenyl, 2-pyrryl and 3-indolyl, and R is selected from the group consisting of H and alkyl of one to five carbon atoms occupying a nuclear position of A.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |