Patent US2852381A successfully refreshed from Google Patents.
US2852381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing polymeric color formers
Assignee: Eastman Kodak Co
•
Filing: 1953-10-13
•
Granted: 1958-09-16
•
Expires: 1973-10-13
Abstract
No abstract record available.
Inventors
- 👤 Louis M Minsk
- 👤 Fred C Duennebier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:23
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; G03C7/3275; C; C08; C08F; C08F8/00; C08F8/10; C08F8/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A GELATION-SILVER HALIDE EMULSION HAVING DISPERSED THEREIN FINELY DIVIDED PARTICLES OF A MIXTURE OF A SUBSTANTIALLY WATER-INSOLUBLE, ORGANIC, CRYSTALLOIDAL MATERIAL HAVING A BOILING POINT ABOVE ABOUT 175*C., AND A FILMFORMING POLYMERIC COLOR FORMER FREE OF CARBOXYL AND SULFO GROUPS AND CONTAINING RECURRING UNITS HAVING THE FOLLOWING GENERAL STRUCTURE:
Claim 2
Dependent Claim
48 words
A GELATION-SILVER HALIDE EMULSION HAVING DISPERSED THEREIN FINELY DIVIDED PARTICLES OF A MIXTURE OF A SUBSTANTIALLY WATER-INSOLUBLE, ORGANIC, CRYSTALLOIDAL MATERIAL HAVING A BOILING POINT ABOVE ABOUT 175*C., AND A FILMFORMING POLYMERIC COLOR FORMER FREE OF CARBOXYL AND SULFO GROUPS AND CONTAINING RECURRING UNITS HAVING THE FOLLOWING GENERAL STRUCTURE:
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |