Patent US3664841A successfully refreshed from Google Patents.
US3664841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide color photographic emulsion containing yellow-forming coupler
Assignee: Konica Minolta Inc
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Filing: 1969-11-28
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Granted: 1972-05-23
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Expires: 1989-11-28
Abstract
Abstract A COMPOUND FOR THE GENERAL FORMULA 1-(R1-C(=O)-CH(-X)-CONH-),2-Y,5-(R3-OOC-CH(-R2)-OOC-) BENZENE WHEREIN R1, R2, R3, X AND Y AS DEFINED IN THE CLAIMS IS FOUND TO BE USEFUL AS A YELLOW COUPLER IN A LIGHT-SENSITIVE SILVER HALIDE EMULSION. THE COMPOUND WHEN USED AS SAID YELLOW COUPLER IS CHARACTERIZED IN THAT IT CAN YIELD A YELLOW DYE IMAGE WITH GOOD STABILITY AGAINST MOISUTRE AND LIGHT ATTACK.
Inventors
- 👤 Masakuni Iwama
- 👤 Isaburo Inoue
- 👤 Yutaka Takei
- 👤 Kenro Sakamoto
- 👤 Takaya Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/362
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |