Patent US29448A successfully refreshed from Google Patents.
US3663552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2'-substituted-cinchona alkaloids
Assignee: Wyeth LLC
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Filing: 1970-04-09
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Granted: 1972-05-16
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Expires: 1990-04-09
Abstract
Abstract 2''-SUBSTITUTED ALKALOIDS OF THE CINCHONA SERIES, ESPECIALLY 2''-SUBSTITUTED QUININE, QUINIDINE, CINCHONIE, CINCHONIDINE AND DIHYDRO ANALOGS OF FORMULAS I AND II, AND THEIR SALTS, ARE PREPARED BY TREATING AR-N-OXIDES OF THE ALKALOIDS WITH THE CORRESPONDING ORGANOMETALLIC REAGENT AND, IF DESIRED, CONVERTING THE FREE BASES THUS FORMED INTO PHARMACEUTICALLY-ACCEPTABLE ACID-ADDITION SALTS. THE NEW COMPOUNDS ARE PHARMACOLOGICALLY ACTIVE, ESPECIALLY ANTIMALARIALLY AND ANTI-ARRHYTHMICALLY.
Inventors
- 👤 John P Yardley
- 👤 Royal E Bright
- 👤 Richard W Rees
- 👤 Herchel Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:25
CPC Classifications
C; C07; C07D; C07D453/00; C07D453/02; C07D453/04
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |