US3582342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive photographic materials
Assignee: Keuffel and Esser Co
•
Filing: 1967-07-14
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Granted: 1971-06-01
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Expires: 1987-07-14
Abstract
Abstract A PHOTOSENSITIVE MATERIAL USEFUL IN COPYING PROCESSES IS PROVIDED BY COMBINING DYES OR COLORLESS DYE BASES WITH PHOTOACTIVATORS SELECTED FROM N-OXIDE COMPOUNDS OF PYRIDINE OR QUINOLINE, OR QUATERNARY SALTS THEREOF, HAVING THE GENERAL FORMULA: UPON EXPOSURE TO LIGHT THE PHOTOACTIVATORS PROVIDE FREE RADICALS WHICH CAUSE A DYE-FORMING OR BLEACHING COLOR CHANGE. (1-(R1-O-),2,3-(-Z-),R-PYRIDINIUM)N X(-) 1-(O=),2,3-(-Z-),R-PYRIDINE OR
Inventors
- 👤 Kohei Itano
- 👤 Masashi Nakano
- 👤 Akira Kato
- 👤 Shoichiro Hoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |