US3781349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyglycolic acid in finely divided form
Assignee: Wyeth Holdings LLC
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Filing: 1971-02-25
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Granted: 1973-12-25
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Expires: 1991-02-25
Abstract
Abstract THIS INVENTION RELATES TO A PROCES FOR PRODUCING FINELY DIVIDED POLYGLYCOLIC ACID COMPRISING DISSOLVING SAID POLYGLYCOLIC ACID IN AN INERT SOLVENT AND THEN ADDING A NONSOLVENT FOR THE POLYGLYCOLIC ACID TO THE SOLUTION THEREBY PRODUCING POLYGLYCOLIC ACID PARTICLES IN FINELY DIVIDED FORM.
Inventors
- 👤 Ramsey W Burton
- 👤 De Lapp D Fiske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/235; C07C59/245; C07C59/285
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |