US2651639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-pyrrolidone-5-carboxamide derivatives and methods of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1951-08-22
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Granted: 1953-09-08
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Expires: 1971-08-22
Abstract
No abstract record available.
Inventors
- 👤 Angier Robert Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:06
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE NEW CHEMICAL COMPOUNDS REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
8 words
THE NEW CHEMICAL COMPOUNDS REPRESENTED BY THE FORMULA:
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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |