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Patent US3982937A successfully refreshed from Google Patents.
US3982937A
Expired / Lapsed
US
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Electrophotographic recording material
Assignee: Hoechst AG
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Filing: 1974-07-12
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Granted: 1976-09-28
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Expires: 1994-07-12
Abstract
Abstract This invention relates to an article which comprises an electrically conductive carrier layer, a layer comprising a material selected from the group consisting of selenium or selenium-tellurium, and, on the side of the selenium or selenium-tellurium layer remote from the carrier layer, a layer comprising an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of polycondensation of 6 to 10.
Inventors
- 👤 Wolfgang Wiedemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:46
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/043; G03G5/0436
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
An article which comprises an electrically conductive carrier layer, a layer comprising a material selected from the group consisting of selenium or selenium-tellurium, and, on the side of the selenium or selenium-tellurium layer remote from the carrier layer, a layer comprising an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of polycondensation of 6 to 10.
Claim 2
Dependent Claim
58 words
An article which comprises an electrically conductive carrier layer, a layer comprising a material selected from the group consisting of selenium or selenium-tellurium, and, on the side of the selenium or selenium-tellurium layer remote from the carrier layer, a layer comprising an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of polycondensation of 6 to 10.
Claim 3
Dependent Claim
20 words
An article as claimed in claim 1 wherein the layer comprising the condensation product also includes a halogenated hydrocarbon plasticizer.
Claim 4
Dependent Claim
18 words
An article as claimed in claim 1 wherein the layer comprising the condensation product also includes a binder.
Claim 5
Dependent Claim
27 words
An article as claimed in claim 3 wherein about 2 parts by weight of the condensation product are present for every 1 part by weight of binder.
Claim 6
Dependent Claim
33 words
An article as claimed in claim 1 wherein the layer which comprises the condensation product also includes a sensitizer or a compound which can form a charge transfer complex with the condensation product.
Claim 7
Dependent Claim
28 words
An article as claimed in claim 1 wherein the layer which comprises the condensation product has a thickness in the range of about 5 to about 30 μm.
Claim 8
Dependent Claim
21 words
An article as claimed in claim 6 wherein the thickness is in the range of about 5 to about 15 μm.
Claim 9
Dependent Claim
27 words
An article as claimed in claim 1 wherein the thickness of the selenium or selenium-tellurium layer is in the range of about 0.1 to about 2 μm.
Claim 10
Dependent Claim
21 words
An article as claimed in claim 8 wherein the thickness is in the range of about 0.1 to about 1.0 μm.
Claim 11
Dependent Claim
13 words
An article as claimed in claim 1 wherein the selenium is 99.999% pure.
Claim 12
Dependent Claim
17 words
An article as claimed in claim 1 wherein the selenium or selenium-tellurium layer is a vapor-deposited layer.
Claim 13
Dependent Claim
14 words
An article as claimed in claim 1 wherein the carrier layer comprises aluminum foil.
Claim 14
Dependent Claim
30 words
An article as claimed in claim 1 wherein the carrier layer comprises a plastic material having a layer of aluminum, gold, copper, zinc, cadmium, indium, antimony, nickel or tin thereon.
Claim 15
Dependent Claim
23 words
An article as claimed in claim 1 which also comprises an intermediate layer between the carrier layer and the selenium or selenium-tellurium layer.
Claim 16
Dependent Claim
15 words
An article as claimed in claim 14 wherein the intermediate layer comprises an organic material.
Claim 17
Dependent Claim
18 words
An article as claimed in claim 15 wherein the thickness of the intermediate layer is about 1 μm.
Claim 18
Dependent Claim
15 words
An article as claimed in claim 14 wherein the intermediate layer comprises a metal oxide.
Claim 19
Dependent Claim
22 words
An article as claimed in claim 17 wherein the thickness of the intermediate layer is about 10 2 to 10 4 A.
Claim 20
Dependent Claim
76 words
Electrophotographic recording material composed of an electrically conductive carrier material and a photoconductive double layer of which the layer adjacent to the carrier material is composed of amorphous selenium or selenium/tellurium, and the layer adjacent to this layer contains an organic photodconductor, the charge carrier transport layer which is adjacent to the amorphous selenium or selenium/tellurium layer containing an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of crosslinking n = 6 to 10.
Claim 21
Dependent Claim
76 words
Electrophotographic recording material composed of an electrically conductive carrier material and a photoconductive double layer of which the layer adjacent to the carrier material is composed of amorphous selenium or selenium/tellurium, and the layer adjacent to this layer contains an organic photodconductor, the charge carrier transport layer which is adjacent to the amorphous selenium or selenium/tellurium layer containing an oligomeric condensation product of 3-bromopyrene and formaldehyde having a degree of crosslinking n = 6 to 10.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |