Patent US3759908A successfully refreshed from Google Patents.
US3759908A
Expired / Lapsed
US
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Photography 4-thiouracil compounds process for their preparation and their use in
Assignee: Eastman Kodak Co
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Filing: 1971-02-12
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Granted: 1973-09-18
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Expires: 1991-02-12
Abstract
Abstract 4-THIOURACIL COMPOUNDS, INCLUDING NOVEL 4-THIOURACIL COMPOUNDS, ARE PREPARED BY REACTING AMMONIA OR A PRIMARY AMINE WITH NOVEL ADDUCTS OF AN ALKOXYCARBONYL ISOTHIOCYANATE AND A TERTIARY ENAMINE. THE 4-THIOURACIL COMPOUNDS ARE USEFUL PHOTOGRAPHIC FOG INHIBITORS.
Inventors
- 👤 R Lamon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:27
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/14; C07D295/145; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |