US4122129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Normally-solid, bioabsorbable, hydrolyzable, polymeric reaction product
Assignee: Wyeth Holdings LLC
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Filing: 1977-05-05
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Granted: 1978-10-24
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Expires: 1997-05-05
Abstract
Abstract A normally-solid, bioabsorbable, hydrolyzable, polymeric reaction product of (A) a polyglycolic acid composition and (B) a polyester of diglycolic acid and an unhindered glycol and to the process of preparing the same and the use of said polymeric reaction product as a sterile surgical element and as a device for the controlled continuous administration of a predetermined dosage of a drug to a living animal.
Inventors
- 👤 Donald James Casey
- 👤 Martin Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; A61L15/00; A61L15/16; A61L15/42; A61L15/64; A61L17/14; A61L17/145; C; C08; C08G; C08G63/00; C08G63/66; C08G63/664
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A process for producing a normally solid, bioabsorbable, hydrolyzable polymeric reaction product comprising heating at its melting point (A) a polyglycolic acid composition having a molecular weight of at least 30,000; adding to the molten polyglycolic acid composition (B) from about 2% to about 50%, by weight, based on the total weight of (A) and (B) of a polyester of diglycolic acid and an unhindered glycol having a molecular weight sufficiently high so as to provide a polymeric material possessing self-supporting film-forming properties, and continuing the heating of the mixture at or above the melting temperature of the polyglycolic acid until the transesterification reaction is substantially completed.
Claim 2
Dependent Claim
107 words
A process for producing a normally solid, bioabsorbable, hydrolyzable polymeric reaction product comprising heating at its melting point (A) a polyglycolic acid composition having a molecular weight of at least 30,000; adding to the molten polyglycolic acid composition (B) from about 2% to about 50%, by weight, based on the total weight of (A) and (B) of a polyester of diglycolic acid and an unhindered glycol having a molecular weight sufficiently high so as to provide a polymeric material possessing self-supporting film-forming properties, and continuing the heating of the mixture at or above the melting temperature of the polyglycolic acid until the transesterification reaction is substantially completed.
References Cited (Backward Citations)
US3991766A
Cited
US3997512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |