Patent US3598598A successfully refreshed from Google Patents.
US3598598A
Expired / Lapsed
US
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Fog stabilizers for photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1968-10-01
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Granted: 1971-08-10
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Expires: 1988-10-01
Abstract
Abstract A PHOTOGRAPHIC SILVER HALIDE EMULSION OR PHOTOGRAPHIC ELEMENT CONTAINING A FOG-STABILIZING AMOUNT OF A THIONAMIDE, E.G., A 3 SUBSTITUTED THIAZOLINE-2-THIONE, N,N-DISUBSTITUTED DITHIOCARBAMIC ESTER OF AN N,N,N'',N''-TETRASUBSTITUTED THIOUREA, WHICH CONTAINS AT LEAST ONE ACID GROUP IN THE MOLECULE IS DISCLOSED. THE ACID GROUP OR GROUPS CONTAINED IN THE THIONAMIDE MOLECULE SHOULD BE ONES WHICH WILL CONFER A NEGATIVE CHARGE TO THE THIONE AT A PH OR 5 OR BELOW AND IS EXEMPLIFIED BY CARBOXYLIC OR SULFONIC ACID GROUPS. SILVER HALIDE COMPLEXES OF THIONAMIDES AND DEVELOPING PHOTOGRAPHIC ELEMENTS ARE ALSO DESCRIBED.
Inventors
- 👤 Arthur H Herz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:31
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; 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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |