US3669671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide photographic emulsions containing yellow couplers
Assignee: Konica Minolta Inc
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Filing: 1969-12-12
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Granted: 1972-06-13
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Expires: 1989-12-12
Abstract
Abstract NEW COMPOUNDS OF THE GENERAL FORMULA 1-(X-CO-CH(-A)-CO-NH-),2-(Y,Z-PHENOXY-),5-(R1-OOC-)BENZENE WHEREIN X IS-C(CH3)3 OR W-PHENYL- W IS HYDROGEN, C6-18 ACYLAMINO, LOWER ALKOXY, HALOGEN OR LOWER ALKYL; R1 IS AN ALIPHATIC HYDROCARBON RADICAL HAVING 1-18 CARBON ATOMS; Y AND Z ARE EACH HYDROGEN, HALOGEN, LOWER ALKOXY, LOWER ALKYL OR-COOR2; A IS HYDROGEN, HALOGEN OR-OCOR3; R2 AND R3 ARE EACH LOWER ALKYL ARE FOUND TO BE USEFUL AS YELLOW-FORMING COLOR COUPLERS OF THE PROTECTED TYPE IN LIGHT-SENSITIVE SILVER HALIDE PHOTOGRAPHIC EMULSIONS. THESE COMPOUNDS CAN BE SYNTHESIZED FROM READILY AVAILABLE STARTING MATERIALS WITH EASE AND AT CHEAP COST.
Inventors
- 👤 Masakuni Iwama
- 👤 Isaburo Inoue
- 👤 Teruo Hanzawa
- 👤 Kenro Sakamoto
- 👤 Takaya Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |