US3707376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of sensitizing silver halide emulsion with poly(alkylene oxide) and sulfur compounds
Assignee: EIDP Inc
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Filing: 1970-11-23
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Granted: 1972-12-26
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Expires: 1990-11-23
Abstract
Abstract PROCESS FOR IMPROVING THE SENSITIVITY/FOG RATIO OF PHOTOGRAPHIC SILVER HALIDE EMULSIONS SENSITIZED WITH POLY(ALKYLENE OXIDE) COMPOUNDS AND SULFUR SENSITIZERS BY ADDING THE SULFUR SENSITIZER DURING OR IMMEDIATELY AFTER SILVER HALIDE PRECIPITATION. GELATINE EMULSIONS AND SODIUM AND AMMONIUM THIOSULFATE AND PREFERRED. FULL SENSITIZATION WITH THE POLY (ALKYLENE OXIDES) IS ATTAINED WITHOUT INCREASING DEVELOPMENT FOG.
Inventors
- 👤 Albert Louis Van Stappen
- 👤 Karl Schwarz
- 👤 Hans Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:28
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/04; G03C1/043
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |