US4439584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas and ion permeable membranes formed of polyurethane diacrylate compositions
Assignee: Tyndale Plains Hunter Ltd
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Filing: 1982-09-01
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Granted: 1984-03-27
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Expires: 2002-09-01
Abstract
Abstract Gas and ion permeable membranes useful as burn dressings, surgical drapes and the like formed of polyurethane diacrylate compositions obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are also permeable to other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.
Inventors
- 👤 Francis E. Gould
- 👤 Christian W. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:06
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/42; A61L15/60; A61L17/00; A61L17/04; C; C08; C08F; C08F283/00; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C08G2210/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S528/00; Y10S528/904
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
74 words
A burn dressing comprising a hydrophylic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, and said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate.
Claim 2
Dependent Claim
74 words
A burn dressing comprising a hydrophylic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, and said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate.
Claim 3
Dependent Claim
16 words
The burn dressing of claim 1 having present in said hydrophilic polyurethane diacrylate composition a medicament.
Claim 4
Dependent Claim
11 words
The burn dressing of claim 2 wherein said medicament is sulfadiazine.
Claim 5
Dependent Claim
11 words
The burn dressing of claim 2 wherein said medicament is iodine.
Claim 6
Dependent Claim
12 words
The burn dressing of claim 1 wherein said diacrylate is a dimethacrylate.
Claim 7
Dependent Claim
13 words
The burn dressing of claim 1 wherein said diacrylate is diethylene glycol diacrylate.
Claim 8
Dependent Claim
17 words
The burn dressing of claim 1 wherein said diacrylate is about 25 weight percent of said composition.
Claim 9
Dependent Claim
22 words
The burn dressing of claim 5 wherein said diacrylate is a polyethylene glycol dimethacrylate having an average molecular weight of about 1586.
Claim 10
Dependent Claim
22 words
The burn dressing of claim 1 wherein said diacrylate is a polyethylene glycol diacrylate having an average molecular weight of about 508.
Claim 11
Dependent Claim
21 words
The burn dressing of claim 1 wherein said hydrophylic polyurethane resin is derived from a mixture of polyols and a diisocyanate.
Claim 12
Dependent Claim
17 words
The burn dressing of claim 10 wherein one of the polyols in said mixture is diethylene glycol.
Claim 13
Dependent Claim
29 words
The burn dressing of claim 10 wherein one of the polyols in said mixture is a polyethylene glycol having an average molecular weight between about 400 and about 1450.
Claim 14
Dependent Claim
106 words
A burn dressing comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species is dimensionally stable and exhibits memory; obtained by the reaction of from about 10 to about 35 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a whole number, such that the average molecular weight of the diacrylate is no greater than 1586; in the presence of from about 90 to about 65 weight percent of a hydrophilic polyurethane resin.
Claim 15
Dependent Claim
106 words
A burn dressing comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species is dimensionally stable and exhibits memory; obtained by the reaction of from about 10 to about 35 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a whole number, such that the average molecular weight of the diacrylate is no greater than 1586; in the presence of from about 90 to about 65 weight percent of a hydrophilic polyurethane resin.
Claim 16
Dependent Claim
12 words
The burn dressing of claim 13 wherein said diacrylate is a dimethacrylate.
Claim 17
Dependent Claim
18 words
The burn dressing of claim 13 wherein said diacrylate is about 25 weight percent of the said composition.
Claim 18
Dependent Claim
13 words
The burn dressing of claim 13 wherein said diacrylate is diethylene glycol diacrylate.
Claim 19
Dependent Claim
22 words
The burn dressing of claim 14 wherein said diacrylate is a polyethylene glycol dimethacrylate having an average molecular weight of about 1586.
Claim 20
Dependent Claim
74 words
A gas permeable membrane comprising a hydrophylic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate.
Claim 21
Dependent Claim
74 words
A gas permeable membrane comprising a hydrophylic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate.
Claim 22
Dependent Claim
14 words
The gas permeable membrane of claim 18 in the form of a surgical drape.
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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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |