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US3703584A
Expired / Lapsed
US
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Process of sensitizing converted-type silver halide emulsions with noble-metal salts
Assignee: Eastman Kodak Co
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Filing: 1970-08-20
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Granted: 1972-11-21
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Expires: 1990-08-20
Abstract
Abstract CONVERSION-TYPE SILVER HALIDE EMULSIONS ARE MADE BY ADDING A NOBLE-METAL SALT TO THE EMULSION BEFORE OR DURING THE CONVERSION STEP. IN ONE EMBODIMENT, GOLD SALTS, WHICH ARE GENERALLY KNOWN AS SILVER HALIDE SENSITIZERS, ARE ADDED AFTER INITIAL FORMATION OF THE GRAIN IN THE CONVERSION PROCESS AND BEFORE 80% OF THE CONVERSION STEP IS COMPLETE. IMPROVED INTERNAL-RADIATION SENSITIVITY IS OBSERVED IN CONVERTED-TYPE EMULSIONS MADE BY THIS PROCESS.
Inventors
- 👤 Robert Franklin Motter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; G03C1/06; G03C1/08; G03C1/09; G03C1/035; G03C2001/03523; G03C2200/00; G03C2200/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |