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US3444185A
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US
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Process of preparing 1-(2-oxo 1-pyrrolidino) 4-(1 - pyrrolidino)- but-2-yne and salts thereof
Assignee: CIVILE AUGUIL SOC
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Filing: 1966-11-28
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Granted: 1969-05-13
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Expires: 1986-11-28
Abstract
No abstract record available.
Inventors
- 👤 Pierre P G Nau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:30
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C07D207/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3354178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |