US3672896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic composition element and process
Assignee: Eastman Kodak Co
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Filing: 1969-10-02
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Granted: 1972-06-27
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Expires: 1989-10-02
Abstract
Abstract PHOTOGRAPHIC DEVELOPING AGENTS WHICH ARE ANHYDRO DIHYDRO HEXOSE REDUCTONE SILVER HALIDE DEVELOPING AGENTS PROVIDE LOW STAIN AND IMPROVED STABILITY WITHOUT UNDESIRED SENSITOMETRIC PROPERTIES IN DEVELOPING A LATENT IMAGE IN A PHOTOGRAPHIC ELEMENT. AN AQUEOUS ALKALINE DEVELOPER CONTAINING, FOR INSTANCE, ANHYDRO DIHYDRO PIPERIDINO HEXOSE REDUCTONE PROVIDES IMPROVED PROPERTIES. THE DESCRIBED DEVELOPING AGENTS CAN BE USED IN COMBINATION WITH OTHER SILVER HALIDE DEVELOPING AGENTS.
Inventors
- 👤 Rolf S Gabrielsen
- 👤 Ismael A Olivares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
G; G03; G03C; 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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |