US2632702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolone couplers for color photography
Assignee: Eastman Kodak Co
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Filing: 1949-06-11
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Granted: 1953-03-24
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Expires: 1969-06-11
Abstract
No abstract record available.
Inventors
- 👤 George W Sawdey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:47
CPC Classifications
C; C07; C07D; C07D403/00; C07D403/02; C07D403/12; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; C07D231/44; C07D231/52; C07D403/14; C07D405/00; C07D405/02; C07D405/04; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PHOTOGRAPHIC EMULSION LAYER COMPRISING A CARRIER, SILVER HALIDE AND AS A COLOR-FORMING DEVELOPMENT COMPONENT, THE CONDENSATION PRODUCT OF A PYRAZOLONE HAVING A REACTIVE METHYLENE GROUP IN THE 4-POSITION AND A COMPOUND CONTAINING THE FOLLOWING GROUP:
Claim 2
Dependent Claim
36 words
A PHOTOGRAPHIC EMULSION LAYER COMPRISING A CARRIER, SILVER HALIDE AND AS A COLOR-FORMING DEVELOPMENT COMPONENT, THE CONDENSATION PRODUCT OF A PYRAZOLONE HAVING A REACTIVE METHYLENE GROUP IN THE 4-POSITION AND A COMPOUND CONTAINING THE FOLLOWING GROUP:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |