US5442033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid copolymers of epsilon-caprolactone and lactide
Assignee: Ethicon Inc
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Filing: 1994-11-14
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Granted: 1995-08-15
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Expires: 2014-11-14
Abstract
Abstract A copolymer of from in the range of from about 55 to about 70 weight percent lactide and from in the range of from about 45 to about 30 mole percent ε-caprolactone suitable for use in biomedical applications such as drug delivery, coatings for surgical sutures and needles, and lubricants for medical devices.
Inventors
- 👤 Rao S. Bezwada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; A; A61; A61K; A61K47/00; A61K47/30; A61K47/34; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/105; A61L17/14; A61L17/145; A61L31/00; A61L31/08; A61L31/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A liquid copolymer comprising from in the range of 55 to 70 mole percent lactide and from in the range of 45 to 30 mole percent ε-caprolactone, having an intrinsic viscosity in the range of from about 0.05 to about 0.8 dl/g as determined in a 0.1 g/dl solution of hexafluoroisopropanol at 25° C.
Claim 2
Dependent Claim
54 words
A liquid copolymer comprising from in the range of 55 to 70 mole percent lactide and from in the range of 45 to 30 mole percent ε-caprolactone, having an intrinsic viscosity in the range of from about 0.05 to about 0.8 dl/g as determined in a 0.1 g/dl solution of hexafluoroisopropanol at 25° C.
Claim 3
Dependent Claim
40 words
The copolymer of claim 1 wherein the amount of lactide in the copolymer is in the range of from 55 to 65 mole percent and the amount of ε-caprolactone is in the range of from 45 to 35 mole percent.
Claim 4
Dependent Claim
13 words
The copolymer of claim 2 wherein the copolymers a liquid at 25° C.
Claim 5
Dependent Claim
21 words
The copolymer of claim 3 wherein the intrinsic viscosity of the copolymer is between about 0.05 dl/g and about 0.2 dl/g.
Claim 6
Dependent Claim
12 words
A copolymer of claim 1 wherein the copolymer is a random copolymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-14 | 1999-02-13 | 1999-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-14 | 2003-02-13 | 2003-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-14 | 2007-02-13 | 2007-08-15 | $7700.00 | Window Closed / Lapsed |