Patent US3552959A successfully refreshed from Google Patents.
US3552959A
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Electrophotographic copying paper
Assignee: Ricoh Co Ltd
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Filing: 1968-03-18
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Granted: 1971-01-05
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Expires: 1988-03-18
Abstract
Abstract AN ELECTROPHOTOGRAPHIC COPYING PAPER COMPRISING A SUPPORT PAPER AND A PHOTOCONDUCTIVE LAYER (WHICH IS A LIGHT-SENSITIVE LAYER) COATED ON ONE SURFACE OF SAID SUPPORT AND CONTAINING AN ORGANIC PHOTOCONDUCTIVE MATERIAL, WHEREIN SAID PHOTOCONDUCTIVE LAYER FURTHER CONTAINS A METAL NITRATE, WITH OR WITHOUT AN ORGANIC ACID.
Inventors
- 👤 Nario Yamaguchi
- 👤 Kazuo Tubuko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:42
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/09
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |