Patent US3674474A successfully refreshed from Google Patents.
US3674474A
Expired / Lapsed
US
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Light-sensitive sheet for use in electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1970-09-29
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Granted: 1972-07-04
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Expires: 1990-09-29
Abstract
Abstract A LIGHT-SENSITIVE SHEET FOR USE IN ELECTROPHOTOGRAPHY COMPRISING A SUPPORT ONE SIDE OF WHICH IS PROVIDED WITH AN ELECTROCONDUCTIVE LAYER WHILE THE OPPOSITE SIDE IS PROVIDED WITH A PRECOAT LAYER AND A SUPERPOSED PHOTOCONDUCTIVE LAYER. THE PRECOAT LAYER CONTAINS A WATER SOLUBLE HIGH MOLECULAR WEIGHT SUBSTANCE HAVING AT LEAST ONE HYDROXYL OR CARBOXYL FUNCTIONAL GROUP; A WATER DISPERSIBLE RESIN; AND A POLYMER WHICH IS AT LEAST ONE OF N-METHYLOL ACRYLAMIDE POLYMERS, A COPOLYMER OF N-METHYLOL ACRYLAMIDE AND A VINYL MONOMER OR A COPOLYMER OF POLYETHYLENE TETRAMINE, ADIPIC ACID, UREA AND FORMALDEHYDE.
Inventors
- 👤 Junji Kurokawa
- 👤 Fumiaki Arai
- 👤 Noriyuki Usui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:55
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G5/10; G03G5/101
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |