Patent US2411683A successfully refreshed from Google Patents.
US4028102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamine condensation products in double layer photoconductive recording elements
Assignee: Hoechst AG
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Filing: 1975-12-05
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Granted: 1977-06-07
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Expires: 1995-12-05
Abstract
Abstract This invention relates to a compound of the formula ##STR1## wherein R is a phenylene or naphtylene group. The invention also relates to a process for making the novel compounds of the invention and also to an electrophotographic recording material employing the novel compounds of the invention.
Inventors
- 👤 Jurgen Rochlitz
- 👤 Reinhard Zunker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:12
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/12; C07D495/16; C09; C09B; C09B57/00; C09B57/12; C09B57/14; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0578; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0646; G03G5/0655; G03G5/0657; G03G5/0659
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
An electrophotographic recording material comprising an electrically conductive carrier material having a photoconductive double layer thereon composed of an organic pigment layer of a thickness in the range of about 0.005 to about 2μm and a transparent top layer of organic insulating materials having at least one charge transfer compound in which the organic pigment layer is composed of a compound of at least one of the formulae ##STR3## wherein R is one of the groups ##STR4## which may be substituted.
Claim 2
Dependent Claim
81 words
An electrophotographic recording material comprising an electrically conductive carrier material having a photoconductive double layer thereon composed of an organic pigment layer of a thickness in the range of about 0.005 to about 2μm and a transparent top layer of organic insulating materials having at least one charge transfer compound in which the organic pigment layer is composed of a compound of at least one of the formulae ##STR3## wherein R is one of the groups ##STR4## which may be substituted.
Claim 3
Dependent Claim
22 words
A recording material according to claim 1 wherein the groups ##STR5## are substituted by one or more nitro, halogen or alkoxycarbonyl groups.
Claim 4
Dependent Claim
28 words
A recording material according to claim 1 in which the organic pigment layer is composed of a condensation product of 4,10-benzothioxanthene-3,1'-dicarboxylic anhydride and an o-phenylene-diamine or a 1,8-diaminonaphthalene.
Claim 5
Dependent Claim
25 words
A recording material according to claim 1 in which the organic pigment layer is composed of a condensation product of 4,10-benzothioxanthene-3,1'-dicarboxylic acid anhydride and mononitrophenylenediamine-(1,2).
Claim 6
Dependent Claim
25 words
A recording material according to claim 1 in which the organic pigment layer is composed of a condensation product of 4,10-benzothioxanthene-3,1'-dicarboxylic acid anhydride and monochlorphenylenediamine-(1,2).
Claim 7
Dependent Claim
25 words
A recording material according to claim 1 in which the organic pigment layer is composed of a condensation product of 4,10-benzothioxanthene-3,1'-dicarboxylic acid anhydride and 4-methyloxycarbonylphenylenediamine-(1,2).
Claim 8
Dependent Claim
25 words
A recording material according to claim 1 in which the organic pigment layer is composed of a condensation product of 4,10-benzothioxanthene-3,1'-dicarboxylic acid anhydride and dinitronaphthylenediamine-(1,8).
Claim 9
Dependent Claim
17 words
A recording material according to claim 1 wherein the organic pigment layer is applied by vacuum deposition.
Claim 10
Dependent Claim
18 words
A recording material as claimed in claim 1 having a transparent layer from 5 to 20 μm thick.
References Cited (Backward Citations)
US3299065A
Cited
US3538095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |