Patent US3553251A successfully refreshed from Google Patents.
US3553251A
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US
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Alicyclic compounds
Assignee: Sandoz AG
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Filing: 1968-02-14
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Granted: 1971-01-05
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Expires: 1988-02-14
Abstract
Abstract THE COMPOUNDS ARE OF THE CLASS OF MIXTURES OF CORRESPONDING GEOMETRIC ISOMERS OF 3-HYDROXY-CASSENIC AND ISOCASSENIC ACID B-DIMETHYLAMINOETHYL ESTER DERIVATIVES AND ALSO THE SEPARATE GEOMETRIC ISOMERS 3B-HYDROXY-14DESMETHYL-CASSENIC AND -ISOCASSENIC ACID B(DIMETHYLAMINO) ETHYL ESTER. THESE COMPOUNDS ARE USEFUL AS CARIOTONIC AGENTS WITH A POSITIVE INOTROPIC EFFECT. IMPORTANT INTERMEDIATES IN THE PREPARATION OF THE COMPOUNDS INCLUDE 3-OXO- OR 3B-ACETOXY-14-DESMETHYL-CASSENIC AND -ISOCASSENIC ACID ESTERS, WHICH MAY BE SEPARATED INTO THE RESPECTIVE GEOMETRIC ISOMERS THEREOF BY CHROMATOGRAPHY OR FRACTIONAL CYSTALLIZATION.
Inventors
- 👤 Hartmut Hauth
- 👤 Dietrich Stauffacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:01
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/753; C07C49/755; C07C45/00; C07C45/51; C07C45/511; C07C45/513; C07C45/56; C07C45/57; C07C45/59; C07C45/61; C07C45/67; C07C45/68; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |