Patent US3342599A successfully refreshed from Google Patents.
US3342599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Schiff base developing agent precursors
Assignee: Eastman Kodak Co
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Filing: 1965-06-07
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Granted: 1967-09-19
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Richard L Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:42
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C7/4136; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C8/08; G03C8/32; G03C8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A DRY SILVER HALIDE DEVELOPING COMPOSITION ADAPTED TO BE MIXED WITH WATER FOR DEVELOPING A LATENT IMAGE IN A SILVER HALIDE EMULSION THE IMPROVEMENT COMPRISING, AS A DEVELOPING AGENT PRECURSOR, A SCHIFF BASE WHICH IS A CONDENSATE OF A SALICYLALDEHYDE WITH A SILVER HALIDE DEVELOPING AGENT, SAID CONDENSATE HAVING AT LEAST ONE SALICYLIDENEAMINO GROUP AND HAVING THE PROPERTY OF HYDROLYZING RAPIDLY IN ALKALINE MEDIUM AT A PH ABOVE 9 TO RELEASE A PRIMARY AMINO SILVER HALIDE DEVELOPING AGENT.
Claim 2
Dependent Claim
79 words
IN A DRY SILVER HALIDE DEVELOPING COMPOSITION ADAPTED TO BE MIXED WITH WATER FOR DEVELOPING A LATENT IMAGE IN A SILVER HALIDE EMULSION THE IMPROVEMENT COMPRISING, AS A DEVELOPING AGENT PRECURSOR, A SCHIFF BASE WHICH IS A CONDENSATE OF A SALICYLALDEHYDE WITH A SILVER HALIDE DEVELOPING AGENT, SAID CONDENSATE HAVING AT LEAST ONE SALICYLIDENEAMINO GROUP AND HAVING THE PROPERTY OF HYDROLYZING RAPIDLY IN ALKALINE MEDIUM AT A PH ABOVE 9 TO RELEASE A PRIMARY AMINO SILVER HALIDE DEVELOPING AGENT.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |