Patent US2772282A successfully refreshed from Google Patents.
US2772282A
Expired / Lapsed
US
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3-pyrazolidones
Assignee: Eastman Kodak Co
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Filing: 1953-08-03
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Granted: 1956-11-27
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Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Charles F H Allen
- 👤 Jr John R Byers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:13
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035; C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; C07D231/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A 3-PYRAZOLIDONE COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
7 words
A 3-PYRAZOLIDONE COMPOUND HAVING THE GENERAL FORMULA
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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |