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US3672903A
Expired / Lapsed
US
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Direct-positive silver halide emulsions containing gold salt complex addenda
Assignee: Eastman Kodak Co
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Filing: 1970-02-16
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Granted: 1972-06-27
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Expires: 1990-02-16
Abstract
Abstract GOLD SALT COMPLEXES CAN BE ADDED TO FOGGED, DIRECTPOSITIVE SILVER HALIDE EMULSIONS TO IMPROVE THEIR PHOTOGRAPHIC PROPERTIES, ESPECIALLY THE MAXIMUM DENSITY UPON AGING. PREFERABLY, THE EMULSIONS OF THIS INVENTION CONTAIN REDUCTION AND GOLD FOGGED SILVER HALIDE GRAINS.
Inventors
- 👤 Elizabeth Puiiu Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515
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 |