Patent US4579731A successfully refreshed from Google Patents.
US4579731A
Expired / Lapsed
US
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Polymeric diffusion burn matrix and method of use
Assignee: Key Pharmaceuticals Inc
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Filing: 1984-06-19
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Granted: 1986-04-01
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Expires: 2004-06-19
Abstract
Abstract A protective skin matrix is provided which is particularly suited for the protection of burned or wounded patients. The matrix may be either cured, applied in sheets, or painted or sprayed directly onto the burned or wounded patient. The protective skin matrix includes polyvinylpyrrolidone, polyvinylalcohol, and glycerol.
Inventors
- 👤 Charles L. Fox, Jr.
- 👤 Alec D. Keith
- 👤 Wallace Snipes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:47
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/70; A61K9/7023; A61K9/703; A61K9/7038; A61K9/7046; A61K9/7069; A61K31/00; A61K31/56; A61K31/565; A61K9/20; A61K9/2004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A cured self-supporting polymeric diffusion burn matrix suitable for providing protection to a burned patient comprising in the uncured state from about 2 to about 20% glycerol, from about 4 to about 30% polyvinyl alcohol, and from about 2 to about 20% polyvinylpyrrolidone, the percentages being by weight and a bacterial infection-protecting amount of zinc sulfadiazine or silver sulfadiazine.
Claim 2
Dependent Claim
59 words
A cured self-supporting polymeric diffusion burn matrix suitable for providing protection to a burned patient comprising in the uncured state from about 2 to about 20% glycerol, from about 4 to about 30% polyvinyl alcohol, and from about 2 to about 20% polyvinylpyrrolidone, the percentages being by weight and a bacterial infection-protecting amount of zinc sulfadiazine or silver sulfadiazine.
Claim 3
Dependent Claim
35 words
The polymeric diffusion burn matrix of claim 1 wherein said zinc sulfadiazine or silver sulfadiazine is present in an amount of from about 0.4 to about 2% by final weight of the cured burn matrix.
Claim 4
Dependent Claim
11 words
The polymeric diffusion burn matrix of claim 2 containing zinc sulfadiazine.
Claim 5
Dependent Claim
11 words
The polymeric diffusion burn matrix of claim 2 containing silver sulfadiazine.
Claim 6
Independent Claim
73 words
A method of protecting a burned area of a patient over a prolonged period of time comprising placing over a burned area of a patient a cured polymeric diffusion matrix comprising, prior to being cured, from about 2 to about 20% glycerol, from about 4 to abut 30% polyvinylalcohol, and from about 2 to about 20% polyvinylpyrrolidone, the percentages being by weight and a bacterial infection-protecting amount of zinc sulfadiazine or silver sulfadiazine.
Claim 7
Independent Claim
73 words
A method of protecting a burned area of a patient over a prolonged period of time comprising placing over a burned area of a patient a cured polymeric diffusion matrix comprising, prior to being cured, from about 2 to about 20% glycerol, from about 4 to abut 30% polyvinylalcohol, and from about 2 to about 20% polyvinylpyrrolidone, the percentages being by weight and a bacterial infection-protecting amount of zinc sulfadiazine or silver sulfadiazine.
Claim 8
Dependent Claim
36 words
The method of claim 5 wherein said zinc sulfadiazine or silver sulfadiazine is present in an amount of from about 0.4 to about 2% by weight based on the final weight of the cured burn matrix.
Claim 9
Dependent Claim
10 words
The method of claim 6 wherein zinc sulfadiazine is employed.
Claim 10
Dependent Claim
10 words
The method of claim 6 wherein silver sulfadiazine is employed.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |