US3687678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrally sensitized silver halide photographic material sensitized with xanthylium dyes and acid mercapto compounds
Assignee: Agfa Gevaert AG
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Filing: 1970-08-26
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Granted: 1972-08-29
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Expires: 1990-08-26
Abstract
Abstract THE SENSITIZATION OF LIGHT-SENSITIVE SILVER HALIDE EMULSIONS WHICH IS BROUGHT ABOUT BY XANTHYLIUM, THIAXANTHYLIUM OR SELENAXANTHYLIUM DYES IS LARGELY INCREASED BY USING THESE XANTHYLIUM, THIAXANTHYLIUM OR SEFENUXANTHYLIUM DYES IN COMBINATION WITH EXCESSIVE AMOUNTS OF AN ACID ISOCYCLIC OR HETEROCYCLIC AROMATIC MERCAPTO COMPOUND.
Inventors
- 👤 Oskar Riester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |