Patent US3655643A successfully refreshed from Google Patents.
US3655643A
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US
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14beta-hydroxy-15alpha-acyloxy-cardenolides
Assignee: Bayer Pharma AG
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Filing: 1970-07-27
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Granted: 1972-04-11
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Expires: 1990-07-27
Abstract
Abstract 14B-HYDROXY-UKX-ACYLOXY-CARDENOLIDES OF THE FORMULA 14-HO,15-(R-O-),17-(5-(O=)-2,5-DIHYDROFUR-3-YL)- ANDROST-4-ENE WHERE THE C IN 3 POSITION IS REPLACED BY X WHEREIN-OR IS AN ESTERIFIED HYDROXY GROUP AND X IS >C=O OR >CH-OR'' IN WHICH-OR'' IS A FREE OR ESTERIFIED HYDROXY GROUP, TETRAHYDROPYRANYLOXY GROUP OR SIMILAR READILY CLEAVABLE GLYCOSIDE GROUP ARE CARDIOACTIVE COMPOUNDS WHICH INCREASE HERT STRENGTH WITHOUT REDUCING HEART FREQUENCY.
Inventors
- 👤 Hans-Gunter Lehmann
- 👤 Rudolf Wiechert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:10
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/56; A61K31/58; A61K31/585; C; C07; C07J; C07J19/00; H; H02; H02G; H02G13/00
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |