Patent US3746728A successfully refreshed from Google Patents.
US3746728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphatide derivatives of prostaglandins
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1971-09-10
•
Granted: 1973-07-17
•
Expires: 1991-09-10
Abstract
Abstract THE HALF LIFE OF PROSTAGLANDIN IN THE BLOOD IS PROLONGED BY ADMINISTERING THE PROSTAGLANDIN AS A GLYCERIDE OR PHOSPHATIDE DERIVATIVE. THE GLYCERIDE AND PHOSPHATIDE DERIVATIVES OF PROSTAGLANDINS ARE PREPARED (1) BY RACTING A GLYCEROL OR GLYCEROPHOSPHORIC ACID COMPOUND WITH A PROSTENOIC ACID WHICH HAS HYDROXY GROUPS PROTECTED AND THEN REMOVING THE HYDROXY-PROTECTING GROUPS OR (2) BIOSYNTHETICALLY BY REACTING A PROSTENOIC ACID WITH A GLYCEROL OR GLYCEROPHOSPHORIC ACID COMPOUND.
Inventors
- 👤 J Weisbach
- 👤 M Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:57
CPC Classifications
C; C07; C07C; C07C405/00; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/117
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |