US3189452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-forming photographic process utilizing a bleach-fix followed by a bleach
Assignee: Eastman Kodak Co
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Filing: 1961-12-05
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Granted: 1965-06-15
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Expires: 1981-12-05
Abstract
No abstract record available.
Inventors
- 👤 Charleton C Bard
- 👤 George P Varlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:16
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN THE COLOR PROCESSING OF AN EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER CONTAINING A COLOR COUPLER THAT HAS BEEN COLOR DEVELOPED TO FORM A DYE IMAGE, THE IMPROVEMENT WHICH COMPRISES TREATING THE SAID COLOR DEVELOPED EMULSION LAYER WITH AN AQUEOUS SOLUTION CONTAINING FERRIC CHLORIDE AND A THIOSULFATE SILVER HALIDE SOLVENT AND THEREBY SOLUBILIZING AND REMOVING SILVER AND SILVER HALIDE FROM SAID EMULSION LAYER, AND THEREAFTER FURTHER TREATING THE RESULTING EMULSION LAYER WITH AN AQUEOUS SOLUTION CONTAINIG A FERRICYANIDE SILVER OXIDIZING AGENT AND THEREBY OXIDIZING LEUCO DYE IN SAID EMULSION LAYER TO FULL COLOR INTENSITY.
Claim 2
Dependent Claim
94 words
IN THE COLOR PROCESSING OF AN EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER CONTAINING A COLOR COUPLER THAT HAS BEEN COLOR DEVELOPED TO FORM A DYE IMAGE, THE IMPROVEMENT WHICH COMPRISES TREATING THE SAID COLOR DEVELOPED EMULSION LAYER WITH AN AQUEOUS SOLUTION CONTAINING FERRIC CHLORIDE AND A THIOSULFATE SILVER HALIDE SOLVENT AND THEREBY SOLUBILIZING AND REMOVING SILVER AND SILVER HALIDE FROM SAID EMULSION LAYER, AND THEREAFTER FURTHER TREATING THE RESULTING EMULSION LAYER WITH AN AQUEOUS SOLUTION CONTAINIG A FERRICYANIDE SILVER OXIDIZING AGENT AND THEREBY OXIDIZING LEUCO DYE IN SAID EMULSION LAYER TO FULL COLOR INTENSITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |