Patent US3871880A successfully refreshed from Google Patents.
US3871880A
Expired / Lapsed
US
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Organic photoconductor for electrophotography
Assignee: Pitney Bowes Inc
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Filing: 1972-12-01
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Granted: 1975-03-18
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Expires: 1992-12-01
Abstract
Abstract Photoconductive materials are prepared from an N-aryl carbazole compound and a Lewis acid. The materials are charge transfer complexes with the N-aryl carbazole such as N-phenylcarbazole acting as an electron donor and the Lewis acid such as 2, 4, 7trinitro-9-fluorenone acting as an electron acceptor. The molar ratio of the donor to the acceptor can be in the range from 1:0.5 to 1:1.
Inventors
- 👤 Jean-Pierre Montillier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
A PHOTOCONDUCTIVE ELECTRICALLY INSULATING COMPOSITION COMPRISING A HCARGE TRANSFER COMPLEX OF A LEWIS ACID AND AN N-ARYL CARBAZOLE, CHARACTERIZED BY THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
23 words
A PHOTOCONDUCTIVE ELECTRICALLY INSULATING COMPOSITION COMPRISING A HCARGE TRANSFER COMPLEX OF A LEWIS ACID AND AN N-ARYL CARBAZOLE, CHARACTERIZED BY THE STRUCTURAL FORMULA:
Claim 3
Dependent Claim
13 words
The composition defined in claim 1 wherein said dicarbazolyl cycloalkane is dicarbazolyl cyclobutane.
Claim 4
Dependent Claim
59 words
A photoconductive electrically insulating composition comprising a charge transfer complex of an electron acceptor taken from the group consisting of 2,4,7-trinitro-9-fluoreneone and 2, 4, 5, 7-tetranitro-9-fluorenone and an electron donor as N-phenyl carbazole, the ratio of electron acceptor to donor being from 5:1 to 1:1 and including dicarbazolyl cyclobutane in an amount sufficient to prevent crystallization of said composition.
Claim 5
Dependent Claim
59 words
A photoconductive electrically insulating composition comprising a charge transfer complex of an electron acceptor taken from the group consisting of 2,4,7-trinitro-9-fluoreneone and 2, 4, 5, 7-tetranitro-9-fluorenone and an electron donor as N-phenyl carbazole, the ratio of electron acceptor to donor being from 5:1 to 1:1 and including dicarbazolyl cyclobutane in an amount sufficient to prevent crystallization of said composition.
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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) | 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 |