US4243775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic polyester surgical articles
Assignee: Covidien AG
•
Filing: 1978-11-13
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Granted: 1981-01-06
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Expires: 1998-11-13
Abstract
Abstract A procedure is disclosed employing the sequential addition of monomers to form a copolymer useful in the manufacture of surgical articles.
Inventors
- 👤 Michael N. Rosensaft
- 👤 Richard L. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; C08G63/02; C08G63/06; C08G63/08; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
In a method for the manufacture of sterile surgical articles fabricated from a synthetic absorbable copolymer formed by copolymerizing glycolide as the predominant monomer with a cyclic ester monomer other than glycolide, the improvement comprising employing sequential addition of the monomers in the polymerization, wherein said glycolide monomer, said cyclic ester monomer, or a combination of said monomers is substantially completely polymerized before the addition of the other monomer or said combination.
Claim 2
Dependent Claim
72 words
In a method for the manufacture of sterile surgical articles fabricated from a synthetic absorbable copolymer formed by copolymerizing glycolide as the predominant monomer with a cyclic ester monomer other than glycolide, the improvement comprising employing sequential addition of the monomers in the polymerization, wherein said glycolide monomer, said cyclic ester monomer, or a combination of said monomers is substantially completely polymerized before the addition of the other monomer or said combination.
Claim 3
Dependent Claim
13 words
The method according to claim 1 wherein said cyclic ester monomer is lactide.
Claim 4
Dependent Claim
14 words
The method according to claim 2 wherein said cyclic ester monomer is L(-) lactide.
Claim 5
Dependent Claim
22 words
The method according to claim 2 wherein said cyclic ester monomer is selected from the group consisting of lactones, oxalates or carbonates.
Claim 6
Dependent Claim
13 words
The method according to claim 4 wherein said cyclic ester monomer is 1,4-dioxane-2,3-dione.
Claim 7
Dependent Claim
13 words
The method according to claim 4 wherein said cyclic ester monomer is 1,3-dioxan-2-one.
Claim 8
Dependent Claim
33 words
A copolymer comprising a proportion of sequential units having the formula: ##STR3## and a proportion of sequential units having the formula: ##STR4## wherein formula (II) consists of up to about 50% by weight.
Claim 9
Dependent Claim
33 words
A copolymer comprising a proportion of sequential units having the formula: ##STR3## and a proportion of sequential units having the formula: ##STR4## wherein formula (II) consists of up to about 50% by weight.
Claim 10
Dependent Claim
36 words
A copolymer of claim 7 having a melting point of about 217° C. to 221° C. as described by the peak in a differential scanning calorimeter operating at a heating rate of 10° C. per minute.
Claim 11
Dependent Claim
16 words
A copolymer of claim 8 having an inherent viscosity of about 0.5 dl/g. to 2 dl/g.
Claim 12
Dependent Claim
16 words
A copolymer of claim 9 having an inherent viscosity of about 0.7 dl/g to 1.2 dl/g.
Claim 13
Dependent Claim
20 words
A copolymer of claim 7 or 8 or 10 wherein formula (II) consists of up to about 35% by weight.
Claim 14
Dependent Claim
17 words
A copolymer of claim 11 wherein formula (II) consists of between about 10% to 20% by weight.
References Cited (Backward Citations)
US2683136A
Cited
US2703316A
Cited
US2668162A
Cited
US3268486A
Cited
US3739773A
Cited
US3875937A
Cited
US3297033A
Cited
US3463158A
Cited
US3620218A
Cited
US3268487A
Cited
US3531561A
Cited
US3626948A
Cited
GB1332505A
Cited
US3867190A
Cited
US3784585A
Cited
US3839297A
Cited
US4033938A
Cited
GB1414600A
Cited
US3896802A
Cited
US3937223A
Cited
US4045418A
Cited
US4057537A
Cited
US4137921A
Cited
US4157437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |