Patent US3220838A successfully refreshed from Google Patents.
US3220838A
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US
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Thiosugar silver halide solubilizing agents
Assignee: Eastman Kodak Co
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Filing: 1963-03-19
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Granted: 1965-11-30
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Expires: 1983-03-19
Abstract
No abstract record available.
Inventors
- 👤 Wilbert J Humphlett
- 👤 Grant M Haist
- 👤 James R King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:39
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PHOTOGRAPHIC CHEMICAL TRANSFER METHOD FOR PROCESSING AN IMAGE-EXPOSED SILVER HALIDE EMULSION LAYER WHICH COMPRISES DEVELOPING SAID SILVER HALIDE TO PRODUCE A NEGATIVE SILVER IMAGE, TREATING WITH RESULTING DEVELOPED SILVER HALIDE EMULSION LAYER WITH AN AQUEOUS ALKALINE COMPOSITION, TRANSFERRING UNEXPOSED AND UNDEVELOPED SILVER HALIDE TO A RECEPTION LAYER CONTAINING A SILVER HALIDE PRECIPITATING AGENT, AND REDUCING THE SAID TRANSFERRED SILVER HALIDE TO SILVER, SAID AQUEOUS ALKALINE COMPOSITION CONTAINING AT LEAST ABOUT 3 GRAMS PER LITER OF SAID COMPOSITION OF A SILVER HALIDE SOLUBILIZING AGENT HAVING THE FORMULA
Claim 2
Dependent Claim
87 words
A PHOTOGRAPHIC CHEMICAL TRANSFER METHOD FOR PROCESSING AN IMAGE-EXPOSED SILVER HALIDE EMULSION LAYER WHICH COMPRISES DEVELOPING SAID SILVER HALIDE TO PRODUCE A NEGATIVE SILVER IMAGE, TREATING WITH RESULTING DEVELOPED SILVER HALIDE EMULSION LAYER WITH AN AQUEOUS ALKALINE COMPOSITION, TRANSFERRING UNEXPOSED AND UNDEVELOPED SILVER HALIDE TO A RECEPTION LAYER CONTAINING A SILVER HALIDE PRECIPITATING AGENT, AND REDUCING THE SAID TRANSFERRED SILVER HALIDE TO SILVER, SAID AQUEOUS ALKALINE COMPOSITION CONTAINING AT LEAST ABOUT 3 GRAMS PER LITER OF SAID COMPOSITION OF A SILVER HALIDE SOLUBILIZING AGENT HAVING THE FORMULA
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |