US4885161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressings in gelled paste form
Assignee: Medi-Tech International Corp
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Filing: 1989-01-06
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Granted: 1989-12-05
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Expires: 2009-01-06
Abstract
Abstract A gelled paste composition is provided for dressing of skin wounds. The dressing comprises: (i) a non-cross-linked, nonionic polyacrylamide or polymethacrylamide; (ii) a cross-linked salt of polyacrylic or polymethacrylic acid; and (iii) water. The components are present in the critical ratios of (i) to (ii) of from about 1:25 to 1:15; the ratio of (i) plus (ii) to (iii) being from about 10:1 to 1:3. Glycerine is also a desirable component and, when present, will be found in a ratio of water to glycerine ranging from 5:1 to 1:0.7.
Inventors
- 👤 John Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:41
CPC Classifications
A; A61; A61L; A61L26/00; A61L26/0061; A61L26/008; A61L26/0009; A61L26/0052
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
58 words
A gelled paste composition for dressing skin wounds comprising: (i) a non-cross-linked, nonionic polyacrylamide or polymethacrylamide; (ii) a cross-linked salt of polyacrylic or polymethacrylic acid; and (iii) water, the ratio of (i) to (ii) ranging from about 1:2.5 to 1:10 and the ratio of (iii) to the sum of (i) plus (ii) ranging from about 10:1 to 1:3.
Claim 2
Dependent Claim
58 words
A gelled paste composition for dressing skin wounds comprising: (i) a non-cross-linked, nonionic polyacrylamide or polymethacrylamide; (ii) a cross-linked salt of polyacrylic or polymethacrylic acid; and (iii) water, the ratio of (i) to (ii) ranging from about 1:2.5 to 1:10 and the ratio of (iii) to the sum of (i) plus (ii) ranging from about 10:1 to 1:3.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein there is further present an amount of glycerine, the ratio of water to glycerine being from about 5:1 to 1:0.7.
Claim 4
Dependent Claim
19 words
A composition according to claim 2 wherein the ratio of water to glycerine ranges from about 2:1 to 1:1.
Claim 5
Dependent Claim
19 words
A composition according to claim 1 wherein the ratio of (i) to (ii) ranges from about 1:4 to 1:10.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 wherein the ratio of (i) to (ii) is about 1:8.
Claim 7
Dependent Claim
25 words
A composition according to claim 1 wherein the non-cross-linked nonionic polyacrylamide or polymethacrylamide is present in an amount from about 0.5 to 20% by weight.
Claim 8
Dependent Claim
25 words
A composition according to claim 1 wherein the non-cross-linked, nonionic polyacrylamide or polymethacrylamide is present in an amount from about 0.5 to 10% by weight.
Claim 9
Dependent Claim
26 words
A composition according to claim 1 wherein the non-cross-linked, nonionic polyacrylamide or polymethacrylamide is present in an amount from about 0.8 to about 2% by weight.
Claim 10
Dependent Claim
28 words
A composition according to claim 1 wherein the cross-linked salt of polyacrylic or polymethacrylic acid is present in an amount from about 1% to about 20% by weight.
Claim 11
Dependent Claim
28 words
A composition according to claim 1 wherein the cross-linked salt of polyacrylic or polymethacrylic acid is present in an amount from about 3% to about 15% by weight.
Claim 12
Dependent Claim
28 words
A composition according to claim 1 wherein the cross-linked salt of polyacrylic or polymethacrylic acid is present in an amount from about 6% to about 10% by weight.
Claim 13
Dependent Claim
36 words
A composition according to claim 1 wherein the parts (i) and (iii) have a viscosity ranging from about 10,000 to 100,000 centipoise when measured in water at 2.5% concentration using a Brookfield viscometer at 25° C.
Claim 14
Dependent Claim
22 words
A composition according to claim 1 wherein the polyacrylamide or polymethacrylamide has a molecular weight ranging from about one to ten million.
Claim 15
Dependent Claim
22 words
A composition according to claim 1 wherein the polyacrylamide or polymethacrylamide has a molecular weight ranging from about five to eight million.
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) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |