US3697172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic photography
Assignee: Ricoh Co Ltd
•
Filing: 1969-07-24
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Granted: 1972-10-10
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Expires: 1989-07-24
Abstract
Abstract There is disclosed herein an electrostatic photography method wherein photoconductive sensitive layers are provided on both sides of a support of a photosensitive plate and the reverse side of said plate is illuminated by light either during or before or after corona discharge, to form reproductions on both sides of the photosensitive plate.
Inventors
- 👤 Wasaburo Ohta
- 👤 Setsuo Soga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:09
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/04; G03G5/00; G03G5/02; G03G5/04; G03G5/043; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
A method of electrostatic photography comprising the steps of selecting a photosensitive plate having photoconductive sensitive layers on both sides of a supporting plate, uniformly illuminating one side of said photosensitive plate by overall non-image light exposure in order to decrease the electrical resistivity of said one side, charging the other side of said photosensitive plate by a corona discharge, and said illuminating step being conducted before said charging step.
References Cited (Backward Citations)
US2963365A
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US2962375A
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US3285740A
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US3443936A
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US3561958A
Cited
US3517995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |