Patent US3671257A successfully refreshed from Google Patents.
US3671257A
Expired / Lapsed
US
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Color silver halide photographic material containing yellow-colored magenta-forming color coupler
Assignee: Agfa Gevaert AG
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Filing: 1968-03-20
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Granted: 1972-06-20
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Expires: 1988-03-20
Abstract
Abstract YELLOW-COLORED MAGENTA COLOR-FORMING COLOR COUPLERS HAVING THE FORMULA 1-(3-R1,X-PHENYL),3-(R2-NH-),4-((R3,R4-PHENYL)-N=N-) PYRAZOLIN-5-ONE MAKE VERY EFFECTIVE INTEGRAL MASKS THAT COMPENSATE UNDESIRED BLUE SIDE ABSORPTION OF THE MAGENTA IMAGE.
Inventors
- 👤 Rigobert Otto
- 👤 Gerrit Pankow
- 👤 Arthur Henri De Cat
- 👤 Walter Puschel
- 👤 Willibald Pelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:58
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/333; G03C7/3335
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |