US3764329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat activated dry silver
Assignee: 3M Co
•
Filing: 1972-01-17
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Granted: 1973-10-09
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Expires: 1992-01-17
Abstract
Abstract LIGHT-STABLE SHEET MATERIALS WHICH DARKEN ONLY UNDER RELATIVELY SEVERE HEATING AND ARE RENDERED LIGHT-SENSITIVE AND RAPIDLY HEAT-DEVELOPABLE BY MODERATE HEATING CONTAIN AN IMAGING COMPOSITION CONTAINING AN ORGANIC SILVER SOAP AND A HINDERED PHENOL REDUCING AGENT TOGETHER WITH A SMALL AMOUNT OF A REDUCIBLE HALOGEN COMPOUND HAVING THE ESSENTIAL STRUCTURE -CONX-OR-SO2NX- WHEREIN X IS CHLORINE OR BROMINE.
Inventors
- 👤 J Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49818; G03C1/005; G03C1/06; G03C1/08; G03C1/10
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |