Patent US4920158A successfully refreshed from Google Patents.
US4920158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogel-forming wound dressing or skin coating material
Assignee: Medipro Sciences Ltd
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Filing: 1988-08-22
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Granted: 1990-04-24
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Expires: 2008-08-22
Abstract
Abstract The invention disclosed is a hydrogel-forming wound dressing or skin coating material suitable for household and veterinary use, consisting substantially entirely of wound-compatible and skin-compatible ingredients and comprising a first hydrophilic polymer, selected from polymers or copolymers of acrylic acid, polymers or copolymers of methacrylic acid, polymers or copolymers of itaconic acid, polymers or copolymers of maleic acid and polymers or copolymers of 3-butene-1,2,3-tricarboxylic acid, or combinations thereof, a second hydrophilic polymer which is capable of interacting with the first polymer to produce, upon drying, a hydrogen of improved water resistance and film forming properties relative to the first polymer alone and water. This material is film forming and substantially transparent but capable of being made opaque.
Inventors
- 👤 Douglas G. Murray
- 👤 Dennis C. Smith
- 👤 James E. Guillet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
A; A61; A61L; A61L26/00; A61L26/0061; A61L26/008; A61L26/0009; A61L26/0052; C; C09; C09D; C09D133/00; C09D133/02; C08; C08L; C08L39/00; C08L39/04; C08L39/06; C08L71/00; C08L71/02; C08L89/00; C08L89/04; C08L89/06
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
134 words
A hydrogel-forming wound dressing of skin coating material suitable for household, clinical and veterinary use, consisting substantially entirely of wound and skin compatible ingredients and comprising a first, hydrophilic polymer selected from the group consisting of polymers or copolymers of acrylic acid, polymers or copolymers of methacrylic acid, polymers or copolymers of itaconic acid, polymers or copolymers of maleic acid and polymers or copolymers of 3-butene-1,2,3-tricarboxylic acid, and combinations thereof; a second hydrophilic polymer which is selected from the group consisting of polyethylene oxide and copolymers of ethylene oxide and propylene oxide; a crosslinking agent for the first hydrophilic polymer to effect crosslinking thereof on drying; and water; the material forming a croslinked hydrogel of improved water resistance on drying; the material being film forming and substantially transparent, although capable of being made opaque.
Claim 2
Dependent Claim
134 words
A hydrogel-forming wound dressing of skin coating material suitable for household, clinical and veterinary use, consisting substantially entirely of wound and skin compatible ingredients and comprising a first, hydrophilic polymer selected from the group consisting of polymers or copolymers of acrylic acid, polymers or copolymers of methacrylic acid, polymers or copolymers of itaconic acid, polymers or copolymers of maleic acid and polymers or copolymers of 3-butene-1,2,3-tricarboxylic acid, and combinations thereof; a second hydrophilic polymer which is selected from the group consisting of polyethylene oxide and copolymers of ethylene oxide and propylene oxide; a crosslinking agent for the first hydrophilic polymer to effect crosslinking thereof on drying; and water; the material forming a croslinked hydrogel of improved water resistance on drying; the material being film forming and substantially transparent, although capable of being made opaque.
Claim 3
Dependent Claim
15 words
The hydrogel-forming material according to claim 1 wherein the first hydrophilic polymer is polyacrylic acid.
Claim 4
Dependent Claim
14 words
The hydrogel-forming material according to claim 1 additionally containing at least one suitable plasticizer.
Claim 5
Dependent Claim
31 words
The hydrogel-forming material according to claim 1 comprising a first hydrophilic polymer comprising polymers of acrylic acid; a second hydrophilic polymer comprising polyethylene oxide, at least one suitable plasticizer and water.
Claim 6
Dependent Claim
30 words
The hydrogel-forming material according to claim 3 wherein suitable plasticizers are low molecular weight polyhydroxy compounds selected from the group consisting of propylene glycol, glycerol, sorbitol, gluconolactone, and gluconic acid.
Claim 7
Dependent Claim
10 words
The hydrogel-forming material according to claim 1 additionally containing preservatives.
Claim 8
Dependent Claim
22 words
The hydrogel-forming material according to claim 6 wherein the preservatives are selected from the group consisting of sodium benzoate and sorbic acid.
Claim 9
Dependent Claim
15 words
The hydrogel-forming material according to claim 1 additionally containing a biocompatible powder for gloss reduction.
Claim 10
Dependent Claim
12 words
The hydrogel-forming material according to claim 1 additionally comprising a drying aid.
Claim 11
Dependent Claim
15 words
The hydrogel-forming material according to claim 9 wherein the drying aid is a biocompatible powder.
Claim 12
Dependent Claim
28 words
The hydrogel-forming material according to claim 10 wherein the powder is selected from the group consisting of chitin, talc, cross-linked starch cross-linked gelatin and fully hydrolyzed polyvinyl alcohol.
Claim 13
Dependent Claim
16 words
The hydrogel-forming material according to claim 9 wherein the drying aid is a suitable organic solvent.
Claim 14
Dependent Claim
13 words
The hydrogel-forming material according to claim 12 wherein the solvent is an alcohol.
Claim 15
Dependent Claim
21 words
The hydrogel-forming material according to claim 13 wherein the alcohol is selected from the group consisting of ethanol, methanol and isopropanol.
Claim 16
Dependent Claim
26 words
The hydrogel-forming material according to claim 1 wherein the cross-linking agent is an aluminum salt or derivative thereof or an iron salt or a derivative thereof.
Claim 17
Dependent Claim
34 words
The hydrogel-forming material according to claim 15 wherein said aluminum salt is selected from the group consisting of ammonium alum, sodium alum, potassium alum, and aluminum sulfate and said iron salt is ferric sulrate.
Claim 18
Dependent Claim
14 words
The hydrogel-forming material according to claim 16 wherein said aluminum salt is ammonium alum.
Claim 19
Dependent Claim
15 words
The hydrogel-forming material according to claim 1 in the form of a liquid wound dressing.
Claim 20
Dependent Claim
13 words
The hydrogel-forming material according to claim 1 in the form of an aerosol.
Claim 21
Dependent Claim
16 words
The hydrogel-forming material according to claim 19 further including an organic solvent and a biocompatible powder.
Claim 22
Dependent Claim
18 words
The hydrogel-forming material acording to claim 1 wherein said dressing contains therein a therapeutic agent and a medication.
Claim 23
Dependent Claim
24 words
A hydrogel-forming material which comprises an appropriate blend of polymers of acrylic acid, polyethylene oxide, water, ethanol, glycerol, ammonium alum and cross-linked starch powder.
Claim 24
Dependent Claim
24 words
A hydrogel-forming material which comprises an appropriate blend of polymers of acrylic acid, polyethylene oxide, water, ethanol, glycerol, ammonium alum and cross-linked starch powder.
Claim 25
Dependent Claim
19 words
The hydrogel-forming material of claim 1 in association with an agent which absorbs ultraviolet rays to form a sunscreen.
Claim 26
Dependent Claim
11 words
The hydrogel-forming material of claim 1 in association with a fragrance.
Claim 27
Dependent Claim
12 words
The hydrogel-forming material of claim 1 in association with an insect repellent.
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |