Patent US4489754A successfully refreshed from Google Patents.
Patent US3752803A successfully refreshed from Google Patents.
US3752803A
Expired / Lapsed
US
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Derivatives of 3 - (3' beta-tridigitoxosyl-14' beta-hydroxy-5' beta-androstan - 17' beta-yl)-acrylic acid
Assignee: C.H. Boehringer Sohn AG and Co KG
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Filing: 1971-10-18
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Granted: 1973-08-14
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Expires: 1991-10-18
Abstract
Abstract COMPOUNDS OF THE FORMULA 3-((4,5-DI(HO-),6-CH3-TETRAHYDROPYRAN-2-YL)-(O-(4-HO,6- CH3-TETRAHYDROPYRAN-2-YL))2-O-),14-HO,17-(R3-C(-R2)=CH-), 12-R1-ANDROSTANE WHEREIN R1 IS HYDROGEN OR HYDROXYL, R2 IS HYDROGEN, CHLORINE, FLUORINE, ALKYL OF 1 TO 4 CARBON ATOMS, ALKOXY OF 1 TO 4 CARBON ATOMS OR CYANO, AND R3 IS CYANO, CARBOXYL, CARBALKOXY, CARBARYLOXY OR CARBARALKOXY. THE COMPOUNDS ARE USEFUL AS CARDIOTONIC WITH POSITIVE INOTROPIC ACTION.
Inventors
- 👤 W Eberlein
- 👤 J Heider
- 👤 W Kobinger
- 👤 W Diederen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:01
CPC Classifications
C; C07; C07J; C07J7/00; C07J7/008; C07J7/0085; C07J41/00; C07J41/0033; C07J41/0094; C07J7/009; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |