US3740226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fogged direct-positive silver halide emulsions containing triazolium salts and the use thereof in reversal processes
Assignee: Eastman Kodak Co
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Filing: 1971-06-30
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Granted: 1973-06-19
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Expires: 1991-06-30
Abstract
Abstract FOGGED, DIRECT-POSITIVE, SILVER HALIDE EMULSIONS CAN BE DEVELOPED IN THE PRESENCE OF TRIAZOLIUM SALTS TO PRODUCE IMPROVED PHOTOGRAPHIC PROPERTIES. IN ONE EMBODIMENT, BISTRIAZOLIUM SALTS ARE INCORPORATED IN AT LEAST ONE LAYER OF THE DIRECT-POSITIVE ELEMENT AND REDUCED DICHROIC FOG IS OBSERVED UPON DEVELOPMENT, ESPECIALLY WHEN THE DEVELOPER CONTAINS HIGH HALIDE-ION CONCENTRATIONS.
Inventors
- 👤 G Dappen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:11
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |