Patent US3579346A successfully refreshed from Google Patents.
US3579346A
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Silver halide emulsions with dyes containing a pyrylium nucleus joined to a pyrazole nucleus
Assignee: Eastman Kodak Co
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Filing: 1968-03-25
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Granted: 1971-05-18
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Expires: 1988-03-25
Abstract
Abstract NOVEL PHOTOGRAPHIC METHINE DYES ARE PROVIDED WHICH FEATURE A PYRYLIUM NUCLEUS JOINED, BY A METHINE CHAIN, TO A PYRAZOLE NUCLEUS OR A NITRO SUBSTITUTED NUCLEUS OF THE TYPE USED IN CYANINE DYES. LIGHT SENSITIVE SILVER HALIDE EMULSIONS ARE ALSO PROVIDED COMPRISING THE NOVEL DYES OF THIS INVENTION.
Inventors
- 👤 Leslie G S Brooker
- 👤 Donald W Heseltine
- 👤 Daniel S Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:00
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/04; C09B23/06; C09B23/10; C09B23/105; G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515; G03C1/48523; G03C1/4853
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |