Patent US3065237A successfully refreshed from Google Patents.
US3065237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pyrrolidinones
Assignee: —
•
Filing: —
•
Granted: 1962-11-20
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Expires: 1979-11-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:42
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A METHOD FOR THE PREPARATION OFA COMPOUND HAVING THE FORMULA
Claim 2
Independent Claim
10 words
A METHOD FOR THE PREPARATION OFA COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
FR1068821A
Cited
US2845431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |