US3770757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyes and photographic materials
Assignee: Eastman Kodak Co
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Filing: 1970-12-11
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Granted: 1973-11-06
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Expires: 1990-12-11
Abstract
Abstract NOVEL METHINE DYES ARE PROVIDED WHICH FEATURE A BIS (ALKYLSULFONYL)ALLYLIDENE (OR-PENTADIENYLIDENE) GROUP OR A DIARYLOXYSULFONYL ALLYLIDENE (OR -PENTADIENYLIDENE) GROUP. THE DYES ARE USEFUL AS FILTER DYES IN PHOTOGRAPHIC MATERIALS. CERTAIN DYES OF THE INVENTION FUNCTION AS SPECTRAL SENSITIZERS FOR PHOTOGRAPHIC SILVER HALIDE EMULSIONS.
Inventors
- 👤 G Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:43
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C09; C09B; C09B23/00; C09B23/0008; C09B23/0033
Claims Analysis
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |