US3672906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsions sensitized with methine dyes containing a cyclopentanone nucleus
Assignee: Eastman Kodak Co
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Filing: 1970-03-25
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Granted: 1972-06-27
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Expires: 1990-03-25
Abstract
Abstract NOVEL METHINE DYES CONTAINING A CYCLOPENTANONE NUCLEUS IN THE METHINE CHAIN ARE PREPARED BY THE ACID HYDROLYSIS OF CYANINE ENAMINE DERIVATIVES. THESE METHINE DYES ARE SPECTRAL SENSITIZERS FOR PHOTOGRAPHIC SILVER HALIDE EMULSIONS. A NUMBER OF THE NEW DYES EXTEND TO SENSITIVITY OF PHOTOGRAPHIC SILVER HALIDE EMULSIONS INTO THE RED AND NEAR INFRA-RED REGIONS OF THE SPECTRUM.
Inventors
- 👤 Leslie G S Brooker
- 👤 Arthur Fumia Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:56
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; C09B23/0066; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12
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) | 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 |