Patent US3597213A successfully refreshed from Google Patents.
US3597213A
Expired / Lapsed
US
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Fog reduction in photographic silver halide emulsions
Assignee: GAF Corp
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Filing: 1968-02-12
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Granted: 1971-08-03
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Expires: 1988-02-12
Abstract
Abstract PHOTOGRAPHIC ELEMENTS HAVING THEREON A SILVER HALIDE EMULSION LAYER, AND CONTAINING IN SAID LAYER OR AN ADJACENT LAYER, A 2,2''-(P,P-BIPHENYLENE)-3,3'',5,5''-TETRASUBSTITUTED BISTETRAZOLIUM SALT AS A FOG REDUCING AGENT.
Inventors
- 👤 Fritz Dersch
- 👤 Giacomo Luciani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |