US3740407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihydro-3-(4-hydroxy-1-phenethyl-4-piperidyl)-2-(3h)-furanones
Assignee: Sandoz AG
•
Filing: 1972-05-01
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Granted: 1973-06-19
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Expires: 1992-05-01
Abstract
Abstract THE INVENTION CONCERNS NOVEL COMPOUNDS OF FORMULA: 1-(R2-C6H4-(CH2)2-),4-(2-(O=),5-R1-TETRAHYDROFUR-3-YL), 4-HO-PIPERIDINE WHEREIN R1 IS HYDROGEN OR LOWER ALKYL, AND R2 IS HYDROGEN, FLUORINE, CHLORINE, BROMINE, LOWER ALKYL, LOWER ALKOXY OR LOWER ALKYLTHIO, CYANO, AMINO OR TRIFLUOROMETHYL, OR -NHCOR3, WHEREIN R3 IS LOWER ALKYL, AND PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF. THE COMPOUNDS OF FORMULA I POSSESS USEFUL ANALGESIC 1 REPERTIES. PROCESSES FOR THE PRODUCTION OF THE COMPOUNDS I ARE ALSO DESCRIBED.
Inventors
- 👤 A Ebnoether
- 👤 E Rissi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:48
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/04
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |