Patent US2589943A successfully refreshed from Google Patents.
US2589943A
Expired / Lapsed
US
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4-aryl-4-acyl-oxy-piperidines
Assignee: Ferrosan ApS
•
Filing: 1948-02-27
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Granted: 1952-03-18
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Expires: 1968-02-27
Abstract
No abstract record available.
Inventors
- 👤 Jensen Kai Arne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
PREPARATION OF 4-ARYL-4-ACYLOXY-PIPERIDINE HYDROHALIDES OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
PREPARATION OF 4-ARYL-4-ACYLOXY-PIPERIDINE HYDROHALIDES OF THE GENERAL FORMULA:
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) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |