US4572171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane fixed dressings which harden in the presence of moisture
Assignee: Bayer AG
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Filing: 1983-03-17
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Granted: 1986-02-25
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Expires: 2003-03-17
Abstract
Abstract In a dressing material for the production of fixed dressings, comprising a raschel knit fabric carrier coated and/or impregnated with a resin which hardens in the presence of moisture and contains isocyanate groups, the improvement wherein the raschel fabric construction is such that the ratio of the mean distance between two warp threads to the mean distance between two weft threads is less than about 1.5.
Inventors
- 👤 Christian Wegner
- 👤 Gottfried Schneider
- 👤 Wolfram Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:30
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/14; D04B21/16; A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; D10; D10B; D10B2201/00; D10B2201/01; D10B2201/02; D10B2331/00; D10B2331/04; D10B2509/00; D10B2509/02; D10B2509/024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
In a dressing material for the production of fixed dressings, comprising a raschel knit fabric carrier coated and/or impregnated with a resin which hardens in the presence of moisture and contains isocyanate groups, the improvement wherein the raschel fabric has a weight per unit area of about 40 to 150 g/m 2 and its construction is such that the ratio of the mean distance between two warp threads to the mean distance between two weft threads is less than about 1.5.
Claim 2
Dependent Claim
81 words
In a dressing material for the production of fixed dressings, comprising a raschel knit fabric carrier coated and/or impregnated with a resin which hardens in the presence of moisture and contains isocyanate groups, the improvement wherein the raschel fabric has a weight per unit area of about 40 to 150 g/m 2 and its construction is such that the ratio of the mean distance between two warp threads to the mean distance between two weft threads is less than about 1.5.
Claim 3
Dependent Claim
13 words
A dressing material according to claim 1, wherein the raschel fabric comprises cotton.
Claim 4
Dependent Claim
14 words
A dressing material according to claim 1, wherein the raschel fabric comprises polyester fibers.
Claim 5
Dependent Claim
19 words
A dressing material according to claim 1, wherein the raschel fabric comprises a mixture of cotton and polyester fibers.
Claim 6
Dependent Claim
38 words
A dressing material according to claim 1, wherein the resin which hardens in the presence of moisture and is used for the impregnation is based on a polyisocyanate which has been obtained by phosgenation of an aniline/formaldehyde condensate.
Claim 7
Dependent Claim
23 words
A dressing material according to claim 1, wherein the resin is present in from about 120 to 180% by weight of the carrier.
Claim 8
Dependent Claim
32 words
A dressing material according to claim 1, wherein the ratio of the mean distance between two warp threads to the mean distance between two weft threads in the raschel fabric is ≦1.
Claim 9
Dependent Claim
36 words
A dressing material according to claim 1, wherein the ratio of the mean distance between two warp threads to the mean distance between two weft threads in the raschel fabric is from about 0.5 to 1.
Claim 10
Dependent Claim
20 words
A dressing material according to claim 1, wherein the crosswise extensibility of the raschel fabric is greater than about 100%.
Claim 11
Dependent Claim
105 words
A dressing material according to claim 5, wherein the raschel fabric has a weight per unit area of about 50 to 100 g/m 2 , and a crosswise extensibility greater than about 200%, comprises cotton and/or polyester fibers and the ratio of the mean distance between two warp threads to the mean distance between two weft threads in the raschel fabric is from about 0.5 to 1, the resin which hardens in the presence of moisture being based on a polyisocyanate which has been obtained by phosgenation of an aniline/formaldehyde condensate and being present in from about 120 to 180% by weight of the carrier.
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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |