US4517270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic recording medium
Assignee: BASF SE
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Filing: 1982-03-16
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Granted: 1985-05-14
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Expires: 2002-03-16
Abstract
Abstract An electrophotographic recording medium which consists essentially of an electrically conductive base and a photosemiconductive double layer which comprises a first layer containing charge carrier-producing dyes, and a second layer containing one or more compounds which are charge carrier-transporting when exposed to light, wherein the charge carrier-producing dyes are dark in color, possess substantially panchromatic absorption characteristics, and are of the general formula ##STR1## where R 1 is propyl, 1-hydroxypropyl, 1-methoxypropyl or 1-phenylethyl, Z is p-phenylazoanilino, phenylthio or anilino, and n is 0-6, and a process for the production of this electrophotographic recording medium.
Inventors
- 👤 Fritz Graser
- 👤 Gerhard Hoffmann
- 👤 Reinhold J. Leyrer
- 👤 Peter Neumann
- 👤 Manfred Patsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:56
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0646; G03G5/0657; C; C09; C09B; C09B5/00; C09B5/62; C09B56/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
An electrophotographic recording medium which consists essentially of an electrically conductive base, a first layer containing charge carrier-producing dyes, and a second layer which is substantially transparent to actinic light and is composed to an insulating organic material containing at least one compound which is charge carrier-transporting when exposed to light, wherein the charge carrier-producing dye contained in the first layer is dark in color, possesses substantially panchromatic adsorption characteristics, and is of the formula II ##STR6##
Claim 2
Dependent Claim
77 words
An electrophotographic recording medium which consists essentially of an electrically conductive base, a first layer containing charge carrier-producing dyes, and a second layer which is substantially transparent to actinic light and is composed to an insulating organic material containing at least one compound which is charge carrier-transporting when exposed to light, wherein the charge carrier-producing dye contained in the first layer is dark in color, possesses substantially panchromatic adsorption characteristics, and is of the formula II ##STR6##
Claim 3
Dependent Claim
15 words
where n is 1-6, Z is p-phenylazoanilino, phenylthio or anilino, and R 1 is hydrogen.
Claim 4
Dependent Claim
15 words
where n is 1-6, Z is p-phenylazoanilino, phenylthio or anilino, and R 1 is hydrogen.
Claim 5
Dependent Claim
33 words
An electrophotographic recording medium as claimed in claim 1, wherein in the second layer, which is substantially transparent to actinic light, the compound which is charge carrier-transporting when exposed to light is poly-(N-vinylcarbazole).
Claim 6
Dependent Claim
83 words
A process for the production of an electrophotographic recording medium as claimed in claim 1, wherein a first dispersion containing charge carrier-producing dyes is first applied to an electrically conductive base to give a 0.005-5 μm thick dry layer, a conventional barrier layer is then applied, if desired, and thereafter a solution of an insulating organic material, together with a compound which is charge carrier-transporting when exposed to light, is applied to form a second layer which is 2-40 μm thick when dry.
References Cited (Backward Citations)
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US3871882A
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DE2636421A1
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |