US2476512A
Expired / Lapsed
US
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N-2-ethyl hexyl alpha, alpha'-di-keto beta, beta'-(1, 4-delta2-cyclopentenylene)-pyrrolidine and synthesis thereof
Assignee: Dyk & Co Inc Van
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Filing: 1947-03-08
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Granted: 1949-07-19
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Expires: 1967-03-08
Abstract
No abstract record available.
Inventors
- 👤 Albert A Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:07
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/58; C07D209/72; C07D209/76
Claims Analysis
Total Claims: 0
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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) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |