Patent US2956876A successfully refreshed from Google Patents.
US2956876A
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Mercapto heterocyclic addenda for reversal color development
Assignee: Eastman Kodak Co
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Filing: 1957-09-09
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Granted: 1960-10-18
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Expires: 1977-09-09
Abstract
No abstract record available.
Inventors
- 👤 Spath Catherine Marilyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:33
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/47; C07D249/00; C07D249/02; C07D249/08; C07D249/10; C07D249/12; C07D473/00; C07D473/26; C07D473/36; C07D473/38; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PHOTOGRAPHIC DEVELOPER FOR COLOR PHOTOGRAPHY COMPRISING AN AQUEOUS ALKALINE SOLUTION OF AN AROMATIC PRIMARY AMINE DEVELOPING AGENT CONTAINING, IN ADDITION TO THE PRIMARY AMINE GROUP, A SUBTITUENT SELECTED FROM THE GROUP CONSISTING OF HYDROXY AND AN AMINO GROUP, AN ALKALI METAL SULFITE AND AT LEAST 5 MG. PER LITER OF SOLUTION OF AN ORGANIC HETEROCYCLIC COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
66 words
A PHOTOGRAPHIC DEVELOPER FOR COLOR PHOTOGRAPHY COMPRISING AN AQUEOUS ALKALINE SOLUTION OF AN AROMATIC PRIMARY AMINE DEVELOPING AGENT CONTAINING, IN ADDITION TO THE PRIMARY AMINE GROUP, A SUBTITUENT SELECTED FROM THE GROUP CONSISTING OF HYDROXY AND AN AMINO GROUP, AN ALKALI METAL SULFITE AND AT LEAST 5 MG. PER LITER OF SOLUTION OF AN ORGANIC HETEROCYCLIC COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |