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Patent US3740406A successfully refreshed from Google Patents.
US3740406A
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Dihydro-3(4-hydroxy-1-(di or tri-substituted phenethyl) - 4 - piperidyl)-2-(3h)furanone
Assignee: Sandoz AG
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Filing: 1971-07-20
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Granted: 1973-06-19
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Expires: 1991-07-20
Abstract
Abstract WHEREIN R1 IS FLUORINE, CHLORINE, BROMINE, TRIFLUOROMETHYL, ALKYL OF 1 TO 4 CARBON ATOMS OR ALKOXY OF 1 TO 4 CARBON ATOMS, R2 IS CHLORINE, BROMINE, FLUORINE, ALKYL OF 1 TO 4 CARBON ATOMS OR ALKOXY OF 1 TO 4 CARBON ATOMS, AND R3 IS HYDROGEN, ALKYL OF 1 TO 4 CARNON ATOMS OR ALKOXY OF 1 TO 4 CARBON ATOMS. A PROCESS FOR THEIR PRODUCTION AND INTERMEDIATES THEREFOR ARE ALSO DESCRIBED. THE COMPOUNDS ARE USEFUL AS ANALGESTICS. THE INVENTION CONCERNS NOVEL PIPERIDYL-FURANONE DERIVATIVES OF THE FORMULA: 1-((R1,R2,R3-PHENYL)-(CH2)2-),4-(2-(O=)TETRAHYDROFUR-3- YL),4-HO-PIPERIDINE
Inventors
- 👤 A Ebnoether
- 👤 E Rissi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:40
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 |