US3758309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
-pyrazolo(3,2-c)-s-triazole silver halide emulsions containing sensitizing dyes derived from a 1h
Assignee: Eastman Kodak Co
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Filing: 1971-01-15
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Granted: 1973-09-11
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Expires: 1991-01-15
Abstract
Abstract DYES DERIVED FROM 1H-PYRAZOLO(3,2-C)-S-TRIAZOLES ARE ADVANTAGEOUSLY USED IN PHOTOGRAPHIC SILVER HALIDE ELEMENTS AS SPECTRAL SENSITIZING DYES FOR THE SILVER HALIDE OR AS LIGHT-ABSORBING DYES FOR FILTER LAYERS.
Inventors
- 👤 J Bailey
- 👤 B Heath
- 👤 E Knott
- 👤 P Marr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:26
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C09; C09B; C09B23/00; C09B23/0091; C09B23/02; C09B23/04; C09B23/06; C09B23/08; C09B23/083; C09B23/10; C09B23/105; C09B23/107; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/76; G03C1/825; G03C1/83; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30529; G03C7/32; G03C7/36; G03C7/38; G03C7/381; G03C7/382; G03C7/3825; G03C7/3835; G03C7/384
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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 |