US4840860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiactive electrophotographic element
Assignee: Eastman Kodak Co
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Filing: 1988-03-16
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Granted: 1989-06-20
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Expires: 2008-03-16
Abstract
Abstract An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamin charge-transport material in a mixture of binders comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester of 4,4'-(2-norbornylidene)diphenol and terephthalic and azelaic acids, with the weight ratio of the polycarbonate to the polyester being in the range of 9:1 to 3:7.
Inventors
- 👤 William J. Staudenmayer
- 👤 David S. Weiss
- 👤 Joseph A. Pavlisko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:21
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/056; G03G5/0564
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
In an electrophotographic element comprising: an electrically conductive support; a charge-generation layer comprising a photoconductive material sensitive to visible or infrared radiation; and a charge-transport layer containing a triarylamine charge-transport material, the improvement wherein the charge-transport layer comprises a mixture of a polycarbonate comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester formed from 4,4'-(2-norbornylidene)diphenol and terephthalic and azelaic acids, and the weight ratio of the polycarbonate to the polyester is in the range of 9:1 to 3:7.
Claim 2
Dependent Claim
75 words
In an electrophotographic element comprising: an electrically conductive support; a charge-generation layer comprising a photoconductive material sensitive to visible or infrared radiation; and a charge-transport layer containing a triarylamine charge-transport material, the improvement wherein the charge-transport layer comprises a mixture of a polycarbonate comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester formed from 4,4'-(2-norbornylidene)diphenol and terephthalic and azelaic acids, and the weight ratio of the polycarbonate to the polyester is in the range of 9:1 to 3:7.
Claim 3
Dependent Claim
22 words
The electrophotographic element of claim 1, wherein the molar ratio of terephthalic acid:azelaic acid from which the polyester was formed is 40:60.
Claim 4
Dependent Claim
24 words
The electrophotographic element of claim 1, wherein the weight ratio of the polycarbonate to the polyester is in the range of 8:2 to 6:4.
Claim 5
Dependent Claim
13 words
The electrophotographic element of claim 1, wherein the triarylamine charge-transport material comprises 1,1-bis[di-4-tolylamino)phenyl]-3-phenylpropane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |