US3749735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certificate of correction
Assignee: Eastman Kodak Co
•
Filing: 1970-12-07
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Granted: 1973-07-31
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Expires: 1990-12-07
Abstract
Abstract TWO-EQUIVALENT COUPLERS CONTAINING A 4-HYDROX-1NAPHTHYL GROUP WHEREIN THE HYDROGEN ATOM IN THE 1-POSITION OF THE SAID NAPHTHYL GROUP HAS BEEN REPLACED WITH AN IMIDO GROUP REACT WITH THE OXIDATION PRODUCT OF AN AROMATIC AMINO COLOR DEVELOPING AGENT TO FORM A CYAN DYE AND ARE ADVANTAGEOUSLY INCORPORATED IN COLOR DEVELOPER COMPOSITIONS AND PHOTOGRAPHIC ELEMENTS FOR COLOR PHOTOGRAPHY.
Inventors
- 👤 A Loria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:53
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30523; G03C7/32; G03C7/333; G03C7/3335; G03C8/00; G03C8/02; G03C8/08; G03C8/10
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |