US3811879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive charge-transfer complex with crystallization preventer
Assignee: Pitney Bowes Inc
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Filing: 1972-12-01
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Granted: 1974-05-21
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Expires: 1992-12-01
Abstract
Abstract The invention relates to a photoconductive insulating coating composition, which includes a crystallization prevention agent. The photoresponse of a poly N-vinyl carbazole-trinitrofluorenone charge transfer complex can be improved by increasing the trinitrofluorenone content. This increase is limited by the tendency of the coating to crystallize at a trinitrofluorenonepoly N-vinyl carbazole molar ratio of greater than 1/1. The use of dicarbazolyl cyclobutane as a crystallization prevention agent permits the use of ratios of greater than 1.23/1, even with high curing temperatures.
Inventors
- 👤 J Montillier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:45
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; G03G5/072; G03G5/073; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
The composition of claim 1 wherein the photoconductive chemical complex consists of 2,4,7-trinitro-9-fluorenone and poly-N-vinyl carbazole; and the crystallization inhibitor is dicarbazolyl cyclobutane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |