Patent US4981471A successfully refreshed from Google Patents.
Patent US4118470A successfully refreshed from Google Patents.
US4118470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Normally-solid, bioabsorbable, hydrolyzable, polymeric reaction product
Assignee: Wyeth Holdings LLC
•
Filing: 1977-05-05
•
Granted: 1978-10-03
•
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 19:58
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/664; A; A61; A61K; A61K9/00; A61K9/70; A61K9/7007; A61L; A61L15/00; A61L15/07; A61L15/12; A61L15/16; A61L15/42; A61L15/64; A61L17/00; A61L17/06; A61L17/10; A61L17/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
A device for the controlled continuous administration of a predetermined dosage of a drug to a living animal comprising the polymeric reaction product of (A) a polyglycolic acid composition and (B) a polyester of diglycolic acid and an unhindered glycol; wherein the amount of (B) used is between about 2% and 50%, by weight, based on the total weight of (A) and (B); wherein (A), before reaction with (B), has a molecular weight of at least 30,000 and (B), before reaction with (A), has a molecular weight sufficiently high so as to provide a polymeric material possessing self-supporting film-forming properties, which has dispersed uniformly throughout said polymeric reaction product, a drug formulation.
Claim 2
Independent Claim
112 words
A device for the controlled continuous administration of a predetermined dosage of a drug to a living animal comprising the polymeric reaction product of (A) a polyglycolic acid composition and (B) a polyester of diglycolic acid and an unhindered glycol; wherein the amount of (B) used is between about 2% and 50%, by weight, based on the total weight of (A) and (B); wherein (A), before reaction with (B), has a molecular weight of at least 30,000 and (B), before reaction with (A), has a molecular weight sufficiently high so as to provide a polymeric material possessing self-supporting film-forming properties, which has dispersed uniformly throughout said polymeric reaction product, a drug formulation.
Claim 3
Dependent Claim
13 words
A device according to claim 1 in the form of a self-supporting film.
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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |