US3839297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of stannous octoate catalyst in the manufacture of l(-)lactide-glycolide copolymer sutures
Assignee: Ethicon Inc
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Filing: 1971-11-22
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Granted: 1974-10-01
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Expires: 1991-11-22
Abstract
Abstract High molecular weight copolymers of L(-) lactide and glycolide are prepared by heating a mixture of the monomers at 200*C. in the presence of a stannous octoate catalyst. The copolymers so obtained may be extruded to form filaments having utility as absorbable sutures.
Inventors
- 👤 D Wasserman
- 👤 C Versfelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:09
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
IN POLYMERIZATION OF A MIXTURE OF L(-) LACTIDE AND GLYCOLIDE TO FORM A POLY (L(-) LACTIDE-CO-GLYCOLIDE)OF HIGH MOLECULAR WEIGHT SUITABLE FOR EXTRUSION TO FORM FILAMENTS HAVING UTILITY AS ABSORBABLE SUTURES, THE IMPROVEMENT WHICH COMPRISES HEATING THE MONOMER MIXTURE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF A STANNOUS OCTOATE CATALYST.
Claim 2
Dependent Claim
49 words
IN POLYMERIZATION OF A MIXTURE OF L(-) LACTIDE AND GLYCOLIDE TO FORM A POLY (L(-) LACTIDE-CO-GLYCOLIDE)OF HIGH MOLECULAR WEIGHT SUITABLE FOR EXTRUSION TO FORM FILAMENTS HAVING UTILITY AS ABSORBABLE SUTURES, THE IMPROVEMENT WHICH COMPRISES HEATING THE MONOMER MIXTURE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF A STANNOUS OCTOATE CATALYST.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the molar ratio of monomer to catalyst is 50,000:1.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the molar ratio of monomer to catalyst is 1,500:1.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein a small amount of glycolic acid is added to the reacting monomers.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the monomer mixture is heated at a temperature of about 200*C.
References Cited (Backward Citations)
DD69212A
Cited
GB755447A
Cited
US2890208A
Cited
GB988939A
Cited
US3284417A
Cited
FR2026220A1
Cited
US3636956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |