US4929577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent wound dressings in sheet form
Assignee: Medi-Tech International Corp
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Filing: 1987-03-11
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Granted: 1990-05-29
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Expires: 2007-03-11
Abstract
Abstract A transparent gel composition is provided for dressing of skin wounds. The dressing is in the form of a sheet comprising dextrin and a water-swellable, cross-linked polymer selected from polyacrylamide or polymethacrylamide. The ratio of dextrin to polymer ranges from about 2:1 to 1:1.
Inventors
- 👤 John Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:34
CPC Classifications
A; A61; A61L; A61L26/00; A61L26/0061; A61L26/008; A61L26/0009; A61L26/0052
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A transparent gel composition for dressing skin wounds in the form of a sheet comprising: (i) a dextrin; and (ii) a water-swellable, cross-linked polymer selected from polyacrylamide or polymethacrylamide, wherein the ratio of dextrin to polymer is from about 2:1 to 1:1.
Claim 2
Dependent Claim
42 words
A transparent gel composition for dressing skin wounds in the form of a sheet comprising: (i) a dextrin; and (ii) a water-swellable, cross-linked polymer selected from polyacrylamide or polymethacrylamide, wherein the ratio of dextrin to polymer is from about 2:1 to 1:1.
Claim 3
Dependent Claim
20 words
A composition according to claim 1 wherein the ratio of dextrin to polymer ranges between 2:1 and greater than 1:1.
Claim 4
Dependent Claim
18 words
A composition according to claim 1 wherein the ratio of dextrin to polymer ranges between 1.5:1 to 1.1:1.
Claim 5
Dependent Claim
11 words
A composition according to claim 1 wherein the polymer is polyacrylamide.
Claim 6
Dependent Claim
11 words
A composition according to claim 1 wherein the polymer is polymethacrylamide.
Claim 7
Dependent Claim
19 words
A composition according to claim 1 having water present in an amount from about 50% to 90% by weight.
Claim 8
Dependent Claim
18 words
A composition according to claim 1 having water present in an amount from about 65% to about 80%.
Claim 9
Independent Claim
55 words
A method for healing wounds comprising applying a transparent gel composition as a dressing over a skin wound, said composition being in the form of a sheet comprising: (i) a dextrin; and (ii) a water-swellable, cross-linked polymer selected from polyacrylamide or polymethacrylamide, wherein the ratio of dextrin to polymer is from about 2:1 to 1:1.
Claim 10
Independent Claim
55 words
A method for healing wounds comprising applying a transparent gel composition as a dressing over a skin wound, said composition being in the form of a sheet comprising: (i) a dextrin; and (ii) a water-swellable, cross-linked polymer selected from polyacrylamide or polymethacrylamide, wherein the ratio of dextrin to polymer is from about 2:1 to 1:1.
Claim 11
Dependent Claim
23 words
A method according to claim 8 wherein said composition includes water present in an amount from about 50% to about 90% 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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |