Patent US3672902A successfully refreshed from Google Patents.
US3672902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsion with improved safe-light sensitivity
Assignee: EIDP Inc
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Filing: 1970-08-12
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Granted: 1972-06-27
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Expires: 1990-08-12
Abstract
Abstract LIGHT-SENSITIVE SILVER HALIDE EMULSIONS CONTAINING MIXTURES OF A DIPHENYLDISULFIDE CARBOXYLIC ACID, A POLYHYDROXYSPIRO-BIS-INDANE, A DEVELOPING AGENT AND A POLY(ALKYLENE OXIDE) COMPOUND. THE EMULSIONS HAVE IMPROVED LIGHT-SENSITIVITY WITH REDUCED SENSITIVITY TO SAFE-LIGHT ILLUMINATION.
Inventors
- 👤 Albert Louis Van Stappen
- 👤 Karl Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/09; G03C1/34; G03C1/346; G03C1/36; G03C1/42
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |