US3700442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing agent precursors
Assignee: Eastman Kodak Co
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Filing: 1970-11-02
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Granted: 1972-10-24
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Expires: 1990-11-02
Abstract
Abstract ESTERS OF AMINO REDUCTONES OFFER IMPROVED SOLUBILITY OVER THE PARENT REDUCTONES IN AQUEOUS OR MILDLY ALKALINE SOLUTIONS, IMPROVED STABILITY WHEN PROVIDED AS INCORPORATED DEVELOPING AGENT PRECURSORS IN SILVER HALIDE PHOTOGRAPHIC ELEMENTS, AND ARE ALSO USEFUL AS ANTIOXIDANTS AND ANTI-STAIN AGENTS. THESE ESTERS OF AMINO REDUCTONES, SUCH AS PIPERIDINO HEXOSE REDUCTONE MONOACETATE, ARE USEFUL PHOTOGRAPHIC SILVER HALIDE DEVELOPING AGENT PRECURSORS. THEY CAN BE EMPLOYED IN PHOTOGRAPHIC COMPOSITIONS, ELEMENTS AND/OR PROCESSING COMPOSITIONS.
Inventors
- 👤 Rolf S Gabrielsen
- 👤 Ismael A Olivares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |