US4876331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyester and process for producing the same
Assignee: Mitsubishi Chemical Corp
•
Filing: 1988-08-10
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Granted: 1989-10-24
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Expires: 2008-08-10
Abstract
Abstract According to the present invention, a novel copolyester comprising 3-hydroxybutyrate unit, 3-hydroxyvalerate unit and 5-hydroxyvalerate unit; 3-hydroxybutyrate unit and 4-hydroxybutyrate unit; or 3-hydroxybutyrate unit, 4-hydroxybutyrate unit and 3-hydroxyvalerate unit is easily obtained. Further, since the copolyester according to the present invention has various excellent specific properties, it is extremely suitable as the biomedical materials such as suture material and fixation materials for bone fracture, and its application to various fields such as the slow-releasing system, etc. is expected.
Inventors
- 👤 Yoshiharu Doi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:19
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C12; C12P; C12P7/00; C12P7/62; C12P7/625
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
A copolyester comprising a 3-hydroxybutyrate unit and one selected from the group consisting of (1) a 3-hydroxyvalerate unit and a 5-hydroxyvalerate unit, (2) a 4-hydroxybutyrate unit and (3) a 4-hydroxybutyrate unit and a 3-hydroxyvalerate unit, the intrinsic viscosity of said copolyester being in the range of 0.4 to 10.0 dl/g in chloroform at 30° C.
Claim 2
Dependent Claim
55 words
A copolyester comprising a 3-hydroxybutyrate unit and one selected from the group consisting of (1) a 3-hydroxyvalerate unit and a 5-hydroxyvalerate unit, (2) a 4-hydroxybutyrate unit and (3) a 4-hydroxybutyrate unit and a 3-hydroxyvalerate unit, the intrinsic viscosity of said copolyester being in the range of 0.4 to 10.0 dl/g in chloroform at 30° C.
Claim 3
Dependent Claim
30 words
The copolyester according to claim 1, which comprises 2 to 50 mol% of 3-hydroxybutyrate unit, 3 to 95 mol% of 3-hydroxyvalerate unit and 3 to 90 mol% of 5-hydroxyvalerate unit.
Claim 4
Dependent Claim
23 words
The copolyester according to claim 1, which comprises 40 to 97 mol% of 3-hydroxybutyrate unit and 3 to 60 mol% of 4-hydroxybutyrate unit.
Claim 5
Dependent Claim
30 words
The copolyester according to claim 1, which comprises 10 to 90 mol% of 3-hydroxybutyrate unit, 3 to 60 mol% of 4-hydroxybutyrate unit and 5 to 87 mol% of 3-hydroxyvalerate unit.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |