US3658824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of piperidine
Assignee: Stamicarbon BV
•
Filing: 1970-03-30
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Granted: 1972-04-25
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Expires: 1990-03-30
Abstract
Abstract A PROCESS FOR THE PREPARATION OF PIPERIDINE IS DESCRIBED IN WHICH 4-CYANOBUTYRALDEHYDE IS HYDROGENATED IN THE PRESENCE OF A SUITABLE CATALYST AND AMMONIA.
Inventors
- 👤 Jozef A Thoma
- 👤 Johannes J M Deumens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:28
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/027; C07D295/023
Claims Analysis
Total Claims: 0
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |