US3758308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion containing para fluoro phenols
Assignee: Eastman Kodak Co
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Filing: 1971-02-18
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Granted: 1973-09-11
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Expires: 1991-02-18
Abstract
Abstract A GROUP OF PARA-FLUORO SUBSTITUTED PHENOLS HAVING SUBSTITUTED CARBONAMIDO MOIETIES IN ORTHO AND META POSITION THEREON, THE DESCRIBED COMPOUNDS AND MATERIALS IN CORPORATING THE SAME HAVING PARTICULAR ADVANTAGES IN EFFICIENTLY PRODUCING STABLE CYAN DYES IN EXCELLENT YIELD WHEN REACTED WITH AN OXIDIZED PHENYLENE DIAMINE, PARTICULARLY IN THE CAPACITY OF A 2-EQUIVALENT COLOR PHOTOGRAPHIC COUPLER COMPOUND.
Inventors
- 👤 L Beavers
- 👤 P Lau
- 👤 I Salminen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07C; C07C205/00; C07C205/13; C07C205/26; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/34; G03C7/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |