US5256477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbency alginate fabric, use as wound and burn dressings, and a method for its preparation
Assignee: Convatec Technologies Inc
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Filing: 1991-09-16
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Granted: 1993-10-26
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Expires: 2011-09-16
Abstract
Abstract A non-woven fabric of alginate staple fibres, characterized in that the absorbency of the fabric is greater than 25.0 grams of deionised water or 19.0 grams of saline water per gram of fabric as measured with reference to the test method depicted in FIG. 1, is prepared by a modified needle-tacking process. The fabric is useful for the preparation of wound and burn dressings.
Inventors
- 👤 Peter M. J. Mahoney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:58
CPC Classifications
D; D04; D04H; D04H1/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/682
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A non-woven fabric of alginate staple fibers comprising a mat of alginate staple fibers wherein said fibers are entangled through from 60% to 99% of the thickness of said mat, wherein the absorbency of the fabric is greater than 25.0 grams of deionized water per gram of fabric, said absorbency determined by contacting the fabric with a first end of a water absorbent strip, wherein a second end of the water absorbent strip contacts a deionized water source.
Claim 2
Dependent Claim
78 words
A non-woven fabric of alginate staple fibers comprising a mat of alginate staple fibers wherein said fibers are entangled through from 60% to 99% of the thickness of said mat, wherein the absorbency of the fabric is greater than 25.0 grams of deionized water per gram of fabric, said absorbency determined by contacting the fabric with a first end of a water absorbent strip, wherein a second end of the water absorbent strip contacts a deionized water source.
Claim 3
Dependent Claim
15 words
A fabric according to claim 1 which comprises a non-woven fabric of alginate staple fibres.
Claim 4
Dependent Claim
22 words
A fabric according to claim 1 wherein said fibres are entangled through from 65% to 85% of the thickness of said mat.
Claim 5
Dependent Claim
20 words
A fabric according to claim 3 wherein said fibres are entangled through about 75% of the thickness of said mat.
Claim 6
Dependent Claim
28 words
The fabric according to claim 1 comprising mixed calcium/sodium alginate fibres wherein the ratio of calcium cations to sodium cations is in the range of 40:60 to 90:10.
Claim 7
Dependent Claim
25 words
The fabric according to claim 1 the basis weight whereof is in the range of about 160 g/m 2 to about 350 g/m 2 .
Claim 8
Dependent Claim
13 words
A wound dressing comprising the fabric of alginate fibres according to claim 1.
Claim 9
Dependent Claim
13 words
A burn dressing comprising the fabric of alginate fibres according to claim 1.
Claim 10
Dependent Claim
11 words
The burn dressing according to claim 8 comprising an antimicrobial agent.
Claim 11
Dependent Claim
78 words
A non-woven fabric of alginate staple fibers comprising a mat of alginate staple fibers wherein said fibers are entangled through from 60% to 99% of the thickness of said mat, wherein the absorbency of the fabric is greater than 19.0 grams of saline water per gram of fabric, said absorbency determined by contacting the fabric with a first end of a water absorbent strip, wherein a second end of the water absorbent strip contacts a saline water source.
Claim 12
Dependent Claim
78 words
A non-woven fabric of alginate staple fibers comprising a mat of alginate staple fibers wherein said fibers are entangled through from 60% to 99% of the thickness of said mat, wherein the absorbency of the fabric is greater than 19.0 grams of saline water per gram of fabric, said absorbency determined by contacting the fabric with a first end of a water absorbent strip, wherein a second end of the water absorbent strip contacts a saline water source.
Claim 13
Dependent Claim
50 words
An improvement in a non-woven fabric of alginate staple fibres wherein the improvement consists of entanglement of the fibres through from 60% to 99% of the thickness of the mat whereby the absorbency of the fabric is increased to greater than 25 grams of deionised water per gram of fabric.
Claim 14
Dependent Claim
50 words
An improvement in a non-woven fabric of alginate staple fibres wherein the improvement consists of entanglement of the fibres through from 60% to 99% of the thickness of the mat whereby the absorbency of the fabric is increased to greater than 25 grams of deionised water per gram of fabric.
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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) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |