Patent US3682684A successfully refreshed from Google Patents.
US3682684A
Expired / Lapsed
US
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Wide latitude heat-sensitive copy-sheet and method of making
Assignee: 3M Co
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Filing: 1971-03-10
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Granted: 1972-08-08
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Expires: 1991-03-10
Abstract
Abstract HEAT SENSITVE COPY SHEET CONTAINING BOTH SILVER SOAP AND FERRIC SOAP TOGETHER WITH A REACTANT FOR BOTH, SHOWS INCREASED EXPOSURE LATITUDE IN THERMOGRAPHIC COPYING PROCESS.
Inventors
- 👤 Donald J Newman
- 👤 Donald J Williams
- 👤 John R Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:12
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32; B41M5/333; B41M5/3333; B41M5/3335; G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |