US2944899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of photographic silver halide emulsions
Assignee: Eastman Kodak Co
•
Filing: 1956-10-04
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Granted: 1960-07-12
•
Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Rudolph E Damschroder
- 👤 Herbert B Cowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PHOTOGRAPHIC EMULSION COMPRISING A MIXTURE OF GELATIN, SILVER HALIDE AND A STABILIZING AGENT OF THE CLASS CONSISTING OF 5,5-DIMETHYLCYCLOHEXANEDIONE-1,3, 4-CYANO5-PHENYLCYCLOHEXANEDIONE-1,3,5-PHENYLCYCLOHEXANEDIONE1,3, 3-DICYANOMETHYLENE-5,5-DIMETHYLCYCLOHEXANONE AND 2-METHYL-1-PHENYL-4,6-(1H, 5H) PYRIMIDINE DIONE.
Claim 2
Dependent Claim
27 words
A PHOTOGRAPHIC EMULSION COMPRISING A MIXTURE OF GELATIN, SILVER HALIDE AND A STABILIZING AGENT OF THE CLASS CONSISTING OF 5,5-DIMETHYLCYCLOHEXANEDIONE-1,3, 4-CYANO5-PHENYLCYCLOHEXANEDIONE-1,3,5-PHENYLCYCLOHEXANEDIONE1,3, 3-DICYANOMETHYLENE-5,5-DIMETHYLCYCLOHEXANONE AND 2-METHYL-1-PHENYL-4,6-(1H, 5H) PYRIMIDINE DIONE.
References Cited (Backward Citations)
US2735769A
Cited
US742405A
Cited
US2214446A
Cited
US2444607A
Cited
US2675314A
Cited
US2716059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |