US3755361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydrophenanthrene derivatives
Assignee: STWB Inc
•
Filing: 1969-11-25
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Granted: 1973-08-28
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Expires: 1989-11-25
Abstract
Abstract ALKYL POLYHYDRO-2-PHENANTHRYLIDENEACETATES ARE PREPARED BY INTERACTING THE CORRESPONDING 2-OXOPOLYHYDROPHENANTHRENES WITH A TRI-LOWER-ALKYL A-PHOSPHONO-LOWERALKANOATE. SAID ALKYL POLYHYDRO-2-PHENANTHRYLIDENEACETATES AREHYDROLYZED TO THE FREE ACID, AND THEN REESTERIFIED VIA THE ACID CHLORIDE WITH A TERTIARY-AMINO-LOWER-ALKANOL TO GIVE BASIC ESTERS HAVING CARDIOTONIC ACTIVITY.
Inventors
- 👤 R Clarke
- 👤 P Shaw
- 👤 S Daum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:06
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/40; C07C59/58; C07C59/72; C07C59/42; C07C59/46; C07C59/56; C07C59/76; C07C59/80; C07C59/82; C07C59/90; 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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |