US3990907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing vacuum evaporated selenium photoresponsive layer from base material of drum of electrophotgraphic apparatus
Assignee: Ricoh Co Ltd
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Filing: 1974-09-26
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Granted: 1976-11-09
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Expires: 1994-09-26
Abstract
Abstract To remove an old photoresponsive or photoconductive selenium layer from a drum of a copy machine as preparation for the vacuum evaporation of a new photoresponsive layer thereonto, the drum is immersed in a hot fluid such as water, steam or liquid or vapor trichloroethylene or perchloroethylene. Due to the softening of the photoresponsive layer and the difference between the coefficients of thermal expansion of the photoresponsive layer and the drum material, the photoresponsive layer may be subsequently easily physically removed from the drum.
Inventors
- 👤 Katutoshi Endo
- 👤 Makoto Ohira
- 👤 Shinichi Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:36
CPC Classifications
B; B08; B08B; B08B3/00; B08B3/04; B08B3/10; G; G03; G03G; G03G5/00; G03G5/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A method of removing a photoresponsive layer containing selenium as the main photoresponsive element from a base material having a high degree of smoothness, said photoresponsive layer and said base material having different linear coefficients of thermal expansion, comprising the steps of: a. exposing the photoresponsive layer and the base material to a hot fluid for a period whereby the photoresponsive layer is softened to a rubber-like state, the hot fluid being selected from the group consisting of water, trichloroethylene and perchloroethylene, the temperature of the hot fluid being between 55° C and 150° C; and b. physically removing the photoresponsive layer from the base material while the photoresponsive layer remains hot.
Claim 2
Independent Claim
112 words
A method of removing a photoresponsive layer containing selenium as the main photoresponsive element from a base material having a high degree of smoothness, said photoresponsive layer and said base material having different linear coefficients of thermal expansion, comprising the steps of: a. exposing the photoresponsive layer and the base material to a hot fluid for a period whereby the photoresponsive layer is softened to a rubber-like state, the hot fluid being selected from the group consisting of water, trichloroethylene and perchloroethylene, the temperature of the hot fluid being between 55° C and 150° C; and b. physically removing the photoresponsive layer from the base material while the photoresponsive layer remains hot.
Claim 3
Dependent Claim
21 words
The method according to claim 1, in which the temperature of the hot fluid is between 60° C and 100° C.
Claim 4
Dependent Claim
31 words
The method according to claim 1, in which the difference between the coefficients of thermal expansion of the photoresponsive layer and the base material is greater than 3×10.sup. -5 /° C.
References Cited (Backward Citations)
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US2816008A
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US3338756A
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US3455737A
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US3592691A
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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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |