US3597449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable glycolide and lactide composition
Assignee: Wyeth Holdings LLC
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Filing: 1967-11-16
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Granted: 1971-08-03
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Expires: 1987-11-16
Abstract
Abstract A COMPOSITION COMPRISING PURE OR IMPURE SOLID GLYCOLIDE OR LACTIDE IMMERSED IN TERTIARY AMYL ALCOHOL AND/OR TERTIARY BUTYL ALCOHOL WHICH IS ESSENTIALLY ANHYDROUS AND FREE FROM GLYCOLIDE OR LACTIDE REACTIVE IMPURITIES. GLYCOLIDE AND LACTIDE MAY BE RECRYSTALLIZED FROM THE COMPOSITION TO PRODUCE HIGH YIELDS OF SUBSTANTIALLY PURE GLYCOLIDE OR SUBSTANTIALLY PURE LACTIDE FOLLOWING STORAGE OF THE COMPOSITION FOR PERIODS UP TO ABOUT THREE MONTHS.
Inventors
- 👤 David Anthony Deprospero
- 👤 Edward Emil Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:39
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/10; C07D319/12
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |