US2728661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ascorbic acid ester antistain agents
Assignee: Eastman Kodak Co
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Filing: 1953-10-16
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Granted: 1955-12-27
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Expires: 1973-10-16
Abstract
No abstract record available.
Inventors
- 👤 John B Thirtle
- 👤 Ilmari F Saiminen
- 👤 Weissberger Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/3924; G03C7/39268; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A COLOR-FORMING PHOTOGRAPHIC EMULSION HAVING REDUCED FOGGING TENDENCY, COMPRISING A SILVER HALIDE EMULSION HAVING INCORPORATED THEREIN A NON-DIFFUSING COUPLER COMPOUND AND AS AN ANTISTAIN AGENT AN ASCORBIC ACID ESTER HAVING THE FORMULA WHERE X IS SELECTED FROM THE CLASS CONSISTING OF HYDROXYL AND -OCOR RADICALS, R IS SELECTED FROM THE CLASS CONSISTING OF ALKYL RADICALS, ARYL RADICALS, SULFONATED ALKYL RADICALS, SULFONATED ARYL RADICALS, CARBOXYLATED ALKYL RADICALS AND CARBOXYLATED ARYL RADICALS, AND R'' IS SELCETED FROM THE CLASS CONSISTING OF ALKYL RADICALS CONTAINING FROM 7 TO 18 CARBON ATOMS, ARALKYL RADICALS CONTAINING FROM 7 TO 30 CARBON ATOMS, AND MONONUCLEAR ARYL RADICALS, AND THE ENEDIOL ESTERS OF SAID COMPOUNDS.
Claim 2
Dependent Claim
108 words
A COLOR-FORMING PHOTOGRAPHIC EMULSION HAVING REDUCED FOGGING TENDENCY, COMPRISING A SILVER HALIDE EMULSION HAVING INCORPORATED THEREIN A NON-DIFFUSING COUPLER COMPOUND AND AS AN ANTISTAIN AGENT AN ASCORBIC ACID ESTER HAVING THE FORMULA WHERE X IS SELECTED FROM THE CLASS CONSISTING OF HYDROXYL AND -OCOR RADICALS, R IS SELECTED FROM THE CLASS CONSISTING OF ALKYL RADICALS, ARYL RADICALS, SULFONATED ALKYL RADICALS, SULFONATED ARYL RADICALS, CARBOXYLATED ALKYL RADICALS AND CARBOXYLATED ARYL RADICALS, AND R'' IS SELCETED FROM THE CLASS CONSISTING OF ALKYL RADICALS CONTAINING FROM 7 TO 18 CARBON ATOMS, ARALKYL RADICALS CONTAINING FROM 7 TO 30 CARBON ATOMS, AND MONONUCLEAR ARYL RADICALS, AND THE ENEDIOL ESTERS OF SAID COMPOUNDS.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |