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US3772420A
Expired / Lapsed
US
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Method for improving the in-vivo strength of polyglycolic acid
Assignee: Wyeth Holdings LLC
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Filing: 1971-09-07
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Granted: 1973-11-13
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Expires: 1991-09-07
Abstract
Abstract POLYGLYCOLIC ACID IN SHAPED FORM (I.E. A SUTURE) WHICH IS SUBSTANTIALLY FREE FROM VAPORIZABLE IMPURITIES IS PROVIDED WHICH HAS SIGNIFICANTLY GREATER IN-VIVO STRENGTH RETENTION THAN SHAPED POLYGLYCOLIC ACID CONTAINING SAID VAPORIZABLE IMPURITIES. THE IMPORVED POLYGLYCOLIC ACID IS PREPARED BY VACUUM HEATING SHAPED POLYGLYCOLIC ACID CONTAINING VAPORIZABLE IMPURITIES TO VAPORIZE THE IMPURITIES THEREFROM, AND THEN REMOVING THE VAPORIZED IMPURITIES FROM THE POLYGLYCOLIC ACID. AN APPARATUS FOR CONVENIENTLY CARRYING OUT THE ABOVE PROCESS IS ALSO PROVIDED.
Inventors
- 👤 A Glick
- 👤 J Mcpherson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:37
CPC Classifications
A; A61; A61L; A61L17/00; A61L17/14
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |