US2439098A
Expired / Lapsed
US
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Alkoxy pyrazolone couplers
Assignee: Eastman Kodak Co
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Filing: 1945-06-15
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Granted: 1948-04-06
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Expires: 1965-06-15
Abstract
No abstract record available.
Inventors
- 👤 Henry D Porter
- 👤 Weissberger Arnold
- 👤 Walter A Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
C; C07; C07D; C07D413/00; C07D413/02; C07D413/04; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/28; C07D231/30; C07D231/32; C07D417/00; C07D417/02; C07D417/04; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
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) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |