US4497566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correction of image defects in photoconductive film
Assignee: Eastman Kodak Co
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Filing: 1983-03-03
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Granted: 1985-02-05
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Expires: 2003-03-03
Abstract
Abstract Image defects in liquid-developed photoconductive film, which before use has been stored in roll form at elevated temperature, are corrected by an on-line treatment of the film prior to development. The method comprises heating the photoconductive film prior to charging while under stress-relieving tension and then cooling it.
Inventors
- 👤 Yee S. Ng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:14
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G15/00; G03G15/06; G03G15/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
In a method of forming an image on a photoconductive roll film having a photoconductive layer deposited on a conductive support, which comprises: (a) charging said photoconductive film to uniform polarity; (b) exposing said photoconductive film to actinic radiation, thereby dissipating the charge in the exposed areas and forming a latent electrostatic image; and (c) developing said image on said photoconductive film by contacting the exposed element with an electrophotographic liquid developer, the improvement comprising: heating the photoconductive layer of said film while it is under stress relieving tension and prior to charging, to a temperature above Tg, the glass transition, of said photoconductive layer for a time sufficient to relieve core-set and reduce cracking defects in the photoconductive roll film.
Claim 2
Dependent Claim
121 words
In a method of forming an image on a photoconductive roll film having a photoconductive layer deposited on a conductive support, which comprises: (a) charging said photoconductive film to uniform polarity; (b) exposing said photoconductive film to actinic radiation, thereby dissipating the charge in the exposed areas and forming a latent electrostatic image; and (c) developing said image on said photoconductive film by contacting the exposed element with an electrophotographic liquid developer, the improvement comprising: heating the photoconductive layer of said film while it is under stress relieving tension and prior to charging, to a temperature above Tg, the glass transition, of said photoconductive layer for a time sufficient to relieve core-set and reduce cracking defects in the photoconductive roll film.
Claim 3
Dependent Claim
20 words
The method of claim 1 further comprising the step of cooling said film subsequent to heating and prior to charging.
Claim 4
Dependent Claim
30 words
The method of claim 1 or 2 in which said heating is accomplished by a stream of hot air and said cooling is accomplished by a stream of cool air.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |