Patent US3457280A successfully refreshed from Google Patents.
US3457280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-glycolide and methods for the isolation thereof
Assignee: Wyeth Holdings LLC
•
Filing: 1967-06-12
•
Granted: 1969-07-22
•
Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Edward Emil Schmitt
- 👤 Martin Epstein
- 👤 Rocco Albert Polistina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/10; C07D319/12; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2668162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |