US4915893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polyester filament material
Assignee: RIJKSUNIVERSITEIT TE GRONINGEN A STATE UNIVERSITY OF NETHERLANDS
•
Filing: 1983-07-15
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Granted: 1990-04-10
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Expires: 2003-07-15
Abstract
Abstract Method of preparing a new synthetic surgical filament material by spinning a mixture of a polyester and an additive.
Inventors
- 👤 Sylwester Gogolewski
- 👤 Albert J. Pennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/92; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; C; C08; C08L; C08L67/00; C08L67/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A process for the manufacture for filament involving dry-spinning a spinning mixture comprising a polyester material and an additive, wherein the filament is prepared by dry-spinning, at room temperature, a solution in which the polyester material is poly(L-lactide), PLLA, poly (DL-lactide), PDLLA, or combinations thereof, in a concentration in the range of 5-70% by weight in the presence of the additive, the additive being a polyurethane which is a biodegradable polyester urethane material.
Claim 2
Dependent Claim
73 words
A process for the manufacture for filament involving dry-spinning a spinning mixture comprising a polyester material and an additive, wherein the filament is prepared by dry-spinning, at room temperature, a solution in which the polyester material is poly(L-lactide), PLLA, poly (DL-lactide), PDLLA, or combinations thereof, in a concentration in the range of 5-70% by weight in the presence of the additive, the additive being a polyurethane which is a biodegradable polyester urethane material.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the concentration of the polylactide in the solution is in the range of 10-40% by weight.
Claim 4
Dependent Claim
27 words
A process according to claim 1, wherein CHCL 3 , CH 2 C1 2 ) or both, is used as the solvent material in forming the solution.
Claim 5
Dependent Claim
27 words
A process according to claim 2, wherein CHCL 3 , CH 2 C1 2 , or both, is used as the solvent material in forming the solution.
Claim 6
Dependent Claim
41 words
A process according in claim 1, wherein the additive material used is soluble in CHC1 3 , CH 2 C1 2 , C 2 H 5 OH, or combinations thereof, and has a melt temperature in the range of 40°-180° C.
Claim 7
Dependent Claim
41 words
A process according to claim 2, wherein the additive material used is soluble in CHC1 3 , CH 2 C1 2 , C 2 H 5 OH, or combinations thereof, and has a melt temperature in the range of 40°-180° C.
Claim 8
Dependent Claim
41 words
A process according to claim 3, wherein the additive material used is soluble in CHC1 3 , CH 2 C1 2 , C 2 H 5 OH, or combinations thereof, and has a melt temperature in the range of 40°-180° C.
Claim 9
Dependent Claim
32 words
A process according to claim 1, wherein the concentration of the additive material in the polyester material is in the range of 1-45% by weight and the polyester material is a polylactide.
Claim 10
Dependent Claim
32 words
A process according to claim 2, wherein the concentration of the additive material in the polyester material is in the range of 1-45% by weight and the polyester material is a polylactide.
Claim 11
Dependent Claim
32 words
A process according to claim 3, wherein the concentration of the additive material in the polyester material is in the range of 1-45% by weight and the polyester material is a polylactide.
Claim 12
Dependent Claim
23 words
A process according to claim 1, wherein the concentration of the polylactide in the solution is in the range of 20% by weight.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |