US3271401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrazaindene synthesis for photographic products
Assignee: Eastman Kodak Co
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Filing: 1964-08-20
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Granted: 1966-09-06
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Expires: 1984-08-20
Abstract
No abstract record available.
Inventors
- 👤 Williams Leslie Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:33
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A METHOD FOR PREPARING 6-OXO-1,3,3A,7-TETRAZAINDENE COMPOUNDS USEFUL IN STABILIZING PHOTOGRAPHIC SILVER HALIDE EMULSIONS COMPRISING CONDENSING UNDER ALKALINE CONDITIONS AT A PH OF AT LEAST 8.0 ONE MOLECULE OF AN ALKOXYMETHYLENEMALONIC ACID ESTER HAVING THE FOLLOWING FORMULA:
Claim 2
Independent Claim
36 words
A METHOD FOR PREPARING 6-OXO-1,3,3A,7-TETRAZAINDENE COMPOUNDS USEFUL IN STABILIZING PHOTOGRAPHIC SILVER HALIDE EMULSIONS COMPRISING CONDENSING UNDER ALKALINE CONDITIONS AT A PH OF AT LEAST 8.0 ONE MOLECULE OF AN ALKOXYMETHYLENEMALONIC ACID ESTER HAVING THE FOLLOWING 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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |