US2511231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-cyanophenyl-3-acylamino-5-pyrazolone couplers for color photography
Assignee: Eastman Kodak Co
•
Filing: 1949-03-26
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Granted: 1950-06-13
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Expires: 1969-03-26
Abstract
No abstract record available.
Inventors
- 👤 Weissberger Arnold
- 👤 Paul W Vittum
- 👤 Charles O Edens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:58
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A COLOR-FORMING PHOTOGRAPHIC DEVELOPER COMPRISING A PRIMARY AROMATIC AMINO DEVELOPING AGENT AND A COUPLER COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
18 words
A COLOR-FORMING PHOTOGRAPHIC DEVELOPER COMPRISING A PRIMARY AROMATIC AMINO DEVELOPING AGENT AND A COUPLER COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
US2369489A
Cited
US2343709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |