Patent US3647807A successfully refreshed from Google Patents.
US3647807A
Expired / Lapsed
US
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N-alkyl-1 4-dihydropyridines
Assignee: Bayer AG
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Filing: 1969-11-28
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Granted: 1972-03-07
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Expires: 1989-11-28
Abstract
Abstract NEW 1,4-DIHYDROPYRIDINE DERIVATIVE ARE PROVIDE HAVING BENEFICAL EFFECTS AS CORONARY DILATORS AND SPASMOLYTICS. A REPRESENTATIVE COMPOUND IS 1,2,6-TRIMETHYL-4-(APYRIDYL)-1,4-DIHYDRKOPYRIDINE-3,5-DICARBOXYLIC ACID DIMETHYL ESTER HAVING TYPICAL CHARACTERISTICS OF NEW COMPOUNDS.
Inventors
- 👤 Friedrich Bossert
- 👤 Wulf Vater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:40
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80; C07D211/00; C07D211/04; C07D211/80; C07D211/84; C07D211/90
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |