Patent US3871882A successfully refreshed from Google Patents.
US3871882A
Expired / Lapsed
US
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Electrophotographic recording material
Assignee: Kalle GmbH and Co KG
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Filing: 1973-04-25
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Granted: 1975-03-18
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Expires: 1993-04-25
Abstract
Abstract This invention relates to an electrophotographic recording material consisting of an electroconductive support material and a photoconductive double layer of organic materials which consists of a homogeneous, opaque, charge carrier producing dyestuff layer of a compound corresponding to the general formula WHEREIN A stands for O (oxygen) or NR (imide nitrogen) in which R stands for hydrogen, lower alkyls with one to four carbon atoms, aryl or substituted aryl, aralkyl, a heterocyclic group, or -NHR'', with R'' being either phenyl, which may be substitued, or benzoyl, AND OF A TRANSPARENT TOP LAYER OF INSULATING MATERIALS CONTAINING AT LEAST ONE CHARGE TRANSPORTING COMPOUND.
Inventors
- 👤 Wolfgang Wiedemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
41 words
ELECTROPHOTOGRAPHIC RECORDING MATERIAL COMPRISING AN ELECTROCONDUCTIVE SUPPORT AND A PHOTOCONDUCTIVE DOUBLE LAYER OF ORGANIC MATERIALS THEREON, SAID DOUBLE LAYER BEING COMPOSED OF A TIGHTLY PACKED, HOMOGENEOUS, UNIFORM, OPAQUE, CHARGE CARRIER PRODUCING DYESTUFF LAYER OF A COMPOUND CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Dependent Claim
41 words
ELECTROPHOTOGRAPHIC RECORDING MATERIAL COMPRISING AN ELECTROCONDUCTIVE SUPPORT AND A PHOTOCONDUCTIVE DOUBLE LAYER OF ORGANIC MATERIALS THEREON, SAID DOUBLE LAYER BEING COMPOSED OF A TIGHTLY PACKED, HOMOGENEOUS, UNIFORM, OPAQUE, CHARGE CARRIER PRODUCING DYESTUFF LAYER OF A COMPOUND CORRESPONDING TO THE GENERAL FORMULA
Claim 3
Dependent Claim
24 words
Electrophotographic material according to claim 1, in which the heterocyclic compound is selected from the group consisting of oxazoles, oxadiazoles, triazoles, imidazoles and pyrazoles.
Claim 4
Dependent Claim
14 words
Electrophotographic material according to claim 1, in which the heterocyclic compound is an oxidiazole.
Claim 5
Dependent Claim
13 words
Electrophotographic material according to claim 1, in which the heterocyclic compound is 2,5-bis-(4-diethylaminophenyl)-oxadiazole-1,3,4.
Claim 6
Dependent Claim
14 words
Electrophotographic material according to claim 1, in which the heterocyclic compound is an oxazole.
Claim 7
Dependent Claim
13 words
Electrophotographic material according to claim 1, in which the heterocyclic compound is 2-phenyl-4-(2-chlorophenyl)-5-(4-diethylaminophenyl)-oxazole.
Claim 8
Dependent Claim
38 words
Electrophotographic material according to claim 1, in which the dyestuff layer has a thickness from about 0.005 to about 2 Mu m and the transparent top layer has a thickness from about 5 to about 20 Mu m.
Claim 9
Dependent Claim
26 words
Electrophotographic material according to claim 1, in which the transparent top layer consists of a 1 : 1 mixture of the charge-transporting compound and the binder.
Claim 10
Dependent Claim
37 words
Electrophotographic material according to claim 1, in which the binder is selected from the group consisting of polyesters or copolyesters, silicone resins, reactive resins of polyethers or polyesters and polyfunctional isocyanates, styrene/maleic anhydride copolymers, and polycarbonate resins.
Claim 11
Dependent Claim
21 words
Electrophotographic material according to claim 1, in which the binder is a copolymer of isophthalic acid or terephthalic acid and glycol.
Claim 12
Dependent Claim
15 words
Electrophotographic material according to claim 1, in which the binder is a styrene/maleic anhydride copolymer.
Claim 13
Dependent Claim
17 words
Electrophotographic material according to claim 1, in which the binder is a low molecular weight polyester resin.
Claim 14
Dependent Claim
20 words
Electrophotographic material according to claim 1, in which the transparent top layer additionally contains sensitizers and/or substances forming charge-transfer complexes.
Claim 15
Dependent Claim
22 words
Electrophotographic material according to claim 1, in which an insulating intermediate layer is disposed between the support and the photoconductive double layer.
References Cited (Backward Citations)
US3287123A
Cited
US3384488A
Cited
US3598582A
Cited
US3591374A
Cited
US3634079A
Cited
US3725058A
Cited
US3684548A
Cited
US3740218A
Cited
US3737311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |