US3989535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution of poly(N-acetyl-D-glucosamine)
Assignee: Wyeth Holdings LLC
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Filing: 1975-03-14
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Granted: 1976-11-02
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Expires: 1995-03-14
Abstract
Abstract Poly(N-acetyl-D-glucosamine) is soluble in hexafluoroisopropyl alcohol and hexafluoracetone sesquihydrate. The solutions formed may be wet or dry spun into filaments, or cast into films or solid articles, which may be used as absorbable surgical sutures, or other absorbable surgical elements. Poly(N-acetyl-D-glucosamine) is enzymatically degradable in living tissue, and is resistant to hydrolytic degradation, and, therefore, surgical elements thereof have good storage characteristics under a wide variety of conditions.
Inventors
- 👤 Richard Carl Capozza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:34
CPC Classifications
D; D01; D01F; D01F9/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L17/00; A61L17/06; A61L17/10; C; C08; C08L; C08L5/00; C08L5/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in a fluorinated solvent selected from the group consisting of hexafluoroisopropyl alcohol and hexafluoroacetone sesquihydrate, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
Claim 2
Dependent Claim
32 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in a fluorinated solvent selected from the group consisting of hexafluoroisopropyl alcohol and hexafluoroacetone sesquihydrate, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
Claim 3
Dependent Claim
38 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in hexafluoroisopropyl alcohol in an amount varying from 0.01% to 10% by weight, based on the total weight of the solution, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
Claim 4
Dependent Claim
38 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in hexafluoroisopropyl alcohol in an amount varying from 0.01% to 10% by weight, based on the total weight of the solution, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
Claim 5
Dependent Claim
38 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in hexafluoroacetone sesquihydrate in an amount varying from 0.01% to 10% by weight, based on the total weight of the solution, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
Claim 6
Dependent Claim
38 words
A solution consisting essentially of poly(N-acetyl-D-glucosamine) dissolved in hexafluoroacetone sesquihydrate in an amount varying from 0.01% to 10% by weight, based on the total weight of the solution, and from which the poly(N-acetyl-D-glucosamine) can be recovered essentially undegraded.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |