Patent US3770724A successfully refreshed from Google Patents.
US3770724A
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Process for preparing pentacyclic alkaloids
Assignee: Sanofi Aventis France
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Filing: 1971-03-22
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Granted: 1973-11-06
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Expires: 1991-03-22
Abstract
Abstract PROCESS FOR PREPARING PENTACYCLIC ALKLOIDS OF GENERAL FORMULA: 12-(CH3-OOC-),12-HO,13A-(CH3-CH2-)-1,2,5,6,12,13-3H- INDOLO(3,2,1-DE)PYRIDO(3,2,1-IJ)(1,5)NAPHTHYRIDINE
Inventors
- 👤 E Toromanoff
- 👤 J Warnant
- 👤 A Farcilli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:33
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/14; C07D461/00
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |