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US5217445A Expired / Lapsed US ⏱️ 0.0 years remaining

Absorbent structures containing superabsorbent material and web of wetlaid stiffened fibers

Assignee: Procter and Gamble Co
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Filing: 1990-12-17
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Granted: 1993-06-08
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Expires: 2010-12-17
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Abstract

Abstract Absorbent structures having a wetlaid fluid acquisition/distribution layer with an average dry density of less than about 0.30 g/cc, an average density upon wetting with 1.0% NaCl aqueous solution of less than about 0.20 g/cc, and an average dry basis weight from about 0.001 to about 0.10 g/cm2; and a fluid storage layer positioned beneath the aquisition/distribution layer comprising at least about 15% superabsorbent material. The fluid acquisition/distribution layer comprises from about 50% to 100% chemically stiffened cellulosic fibers and from 0% to about 50% binding means.

Inventors

  • 👤 Gerald A. Young
  • 👤 Danny R. Moore
  • 👤 Jeffrey T. Cook

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 15:43
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/45; A61F13/53; A61F13/534; A61F13/537; A61F13/53743; A61F13/53747; A61F13/15203; A61F2013/15284; A61F2013/15406; A61F2013/15422; A61F2013/530007; A61F2013/530021; A61F2013/530131; A61F2013/530343; A61F2013/53035; A61F2013/530481; A61F2013/530583; A61F2013/530613; A61F2013/53062

Claims Analysis

Total Claims: 25
Claim 1
Independent Claim 197 words
An absorbent article for acquisition, distribution, and storage of bodily fluids, said article comprising: (a) a fluid pervious topsheet; (b) a fluid impervious backsheet affixed to said topsheet; and (c) an absorbent core disposed between said topsheet and said backsheet, said absorbent core having: (i) a wetlaid fluid acquisition/distribution layer having an average dry density of less than about 0.30 g/cc, an average density upon saturation with 1.0% NaCl aqueous solution, on a dry weight basis, of less than about 0.20 g/cc, and an average dry basis weight of from about 0.001 to about 0.10 g/cm 2 , said acquisition/distribution layer comprising from about 50% to 100%, dry weight basis, chemically stiffened cellulosic fibers and from 0% to about 50%, dry weight basis, of a binding means; and (ii) a fluid storage layer, positioned beneath said acquisition/distribution layer relative to said topsheet, comprising at least about 15%, by weight of said storage layer, of superabsorbent material and from 0% to about 85% of a carrier means for said superabsorbent material; said fluid acquisition/distribution layer having a top surface area which is from about 15% to about 95% of the top surface area of said fluid storage layer.
Claim 2
Dependent Claim 197 words
An absorbent article for acquisition, distribution, and storage of bodily fluids, said article comprising: (a) a fluid pervious topsheet; (b) a fluid impervious backsheet affixed to said topsheet; and (c) an absorbent core disposed between said topsheet and said backsheet, said absorbent core having: (i) a wetlaid fluid acquisition/distribution layer having an average dry density of less than about 0.30 g/cc, an average density upon saturation with 1.0% NaCl aqueous solution, on a dry weight basis, of less than about 0.20 g/cc, and an average dry basis weight of from about 0.001 to about 0.10 g/cm 2 , said acquisition/distribution layer comprising from about 50% to 100%, dry weight basis, chemically stiffened cellulosic fibers and from 0% to about 50%, dry weight basis, of a binding means; and (ii) a fluid storage layer, positioned beneath said acquisition/distribution layer relative to said topsheet, comprising at least about 15%, by weight of said storage layer, of superabsorbent material and from 0% to about 85% of a carrier means for said superabsorbent material; said fluid acquisition/distribution layer having a top surface area which is from about 15% to about 95% of the top surface area of said fluid storage layer.
Claim 3
Dependent Claim 49 words
An absorbent article as in claim 1, wherein said fluid acquisition/distribution layer has a top surface area which is from about 25% to about 90% of the top surface area of said storage layer, and said fluid acquisition/distribution layer contains no more than about 2.0%, by weight, superabsorbent material.
Claim 4
Dependent Claim 47 words
An absorbent article as in claim 2, wherein said fluid acquisition/distribution layer has a top surface area which is less than about 80% of the top surface area of said storage layer, and said fluid acquisition/distribution layer contains no more than about 0.5%, by weight, superabsorbent material.
Claim 5
Dependent Claim 32 words
An absorbent article as in claim 2, wherein said acquisition/distribution layer comprises from about 2% to about 25% of the binding means, wherein said binding means is a non-chemically stiffened cellulosic material.
Claim 6
Dependent Claim 41 words
An absorbent article as in claim 4, wherein said acquisition/distribution layer comprises from about 5% to about 15% of said binding means, and said binding means is refined cellulosic fibers having a freeness of less than about 200 Canadian Standard Freeness.
Claim 7
Dependent Claim 35 words
An absorbent article as in claim 4, wherein said binding means comprises high surface area cellulosic material, and said acquisition/distribution layer comprises from about 2% to about 15% of said high surface area cellulosic material.
Claim 8
Dependent Claim 56 words
An absorbent article as in claim 3, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers and said storage layer comprises from about 15% to about 75% of said superabsorbent material, said superabsorbent material being discrete particles of absorbent gelling material having an Absorbent Capacity of at least about 20 g/g.
Claim 9
Dependent Claim 55 words
An absorbent article as in claim 5, wherein said acquisition/distribution layer has an average density upon wetting to saturation with 1.0% NaCl aqueous solution, dry weight basis, that is between about 0.02 g/cc and about 0.15 g/cc and an average dry basis weight of from about 0.01 g/cm 2 to about 0.08 g/cm 2 .
Claim 10
Dependent Claim 55 words
An absorbent article, as in claim 6, wherein said acquisition/distribution layer has an average density upon wetting to saturation with 1.0% NaCl aqueous solution, dry weight basis, that is between about 0.02 g/cc and about 0.15 g/cc and an average dry basis weight of from about 0.01 g/cm 2 to about 0.08 g/cm 2 .
Claim 11
Dependent Claim 58 words
An absorbent article as in claim 8, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers and said storage layer comprises from about 15% to about 75% of said superabsorbent material, said superabsorbent material comprising discrete particles of absorbent gelling material and said storage layer is substantially free of chemically stiffened cellulosic fibers.
Claim 12
Dependent Claim 46 words
An absorbent article as in claim 9, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers, and said storage layer comprises from about 25% to about 75% of said superabsorbent material, said superabsorbent material comprising discrete particles of absorbent gelling material.
Claim 13
Dependent Claim 167 words
An absorbent structure for acquisition, distribution, and storage of bodily fluids, said article comprising: (i) a wetlaid fluid acquisition/distribution layer having an average dry density of less than about 0.30 g/cc, an average density upon saturation with 1.0% NaCl aqueous solution, on a dry weight basis, of less than about 0.20 g/cc, and an average dry basis weight of from about 0.001 to about 0.10 g/cm 2 , said acquisition/distribution layer comprising from about 50% to 100%, dry weight basis, chemically stiffened cellulosic fibers and from 0% to about 50%, dry weight basis, of a binding means; and (ii) a fluid storage layer, positioned beneath said acquisition/distribution layer relative to said topsheet, comprising at least about 15%, by weight of said storage layer, of superabsorbent material and from 0% to about 85% of a carrier means for said superabsorbent material; said fluid acquisition/distribution layer having a top surface area which is from about 15% to about 95% of the top surface area of said fluid storage layer.
Claim 14
Dependent Claim 167 words
An absorbent structure for acquisition, distribution, and storage of bodily fluids, said article comprising: (i) a wetlaid fluid acquisition/distribution layer having an average dry density of less than about 0.30 g/cc, an average density upon saturation with 1.0% NaCl aqueous solution, on a dry weight basis, of less than about 0.20 g/cc, and an average dry basis weight of from about 0.001 to about 0.10 g/cm 2 , said acquisition/distribution layer comprising from about 50% to 100%, dry weight basis, chemically stiffened cellulosic fibers and from 0% to about 50%, dry weight basis, of a binding means; and (ii) a fluid storage layer, positioned beneath said acquisition/distribution layer relative to said topsheet, comprising at least about 15%, by weight of said storage layer, of superabsorbent material and from 0% to about 85% of a carrier means for said superabsorbent material; said fluid acquisition/distribution layer having a top surface area which is from about 15% to about 95% of the top surface area of said fluid storage layer.
Claim 15
Dependent Claim 49 words
An absorbent structure as in claim 12, wherein said fluid acquisition/distribution layer has a top surface area which is from about 25% to about 90% of the top surface area of said storage layer, and said fluid acquisition/distribution layer contains no more than about 2.0%, by weight, superabsorbent material.
Claim 16
Dependent Claim 47 words
An absorbent structure as in claim 13, wherein said fluid acquisition/distribution layer has a top surface area which is less than about 80% of the top surface area of said storage layer, and said fluid acquisition/distribution layer contains no more than about 0.5%, by weight, superabsorbent material.
Claim 17
Dependent Claim 32 words
An absorbent structure, as in claim 12, wherein said acquisition/distribution layer comprises from about 2% to about 25% of the binding means, wherein said binding means is a non-chemically stiffened cellulosic material.
Claim 18
Dependent Claim 39 words
An absorbent structure, as in claim 15, wherein said acquisition/distribution layer comprises from about 5% to about 15% of said binding means, and said binding means is refined cellulosic fibers having a freeness of less than about 200 CSF.
Claim 19
Dependent Claim 35 words
An absorbent structure, as in claim 15, wherein said binding means comprises high surface area cellulosic material, and said acquisition/distribution layer comprises from about 2% to about 25% of said high surface area cellulosic material.
Claim 20
Dependent Claim 68 words
An absorbent structure, as in claim 12, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers and said storage layer comprises from about 15% to about 75% of said superabsorbent material, said superabsorbent material being discrete particles of absorbent gelling material having an Absorbent Capacity of at least about 20 g/g and said storage layer is substantially free of chemically stiffened cellulosic fibers.
Claim 21
Dependent Claim 55 words
An absorbent structure, as in claim 16, wherein said acquisition/distribution layer has an average density upon wetting to saturation with 1.0% NaCl aqueous solution, dry weight basis, that is between about 0.02 g/cc and about 0.15 g/cc and an average dry basis weight of from about 0.01 g/cm 2 to about 0.04 g/cm 2 .
Claim 22
Dependent Claim 55 words
An absorbent structure, as in claim 17, wherein said acquisition/distribution layer has an average density upon wetting to saturation with 1.0% NaCl aqueous solution, dry weight basis, that is between about 0.02 g/cc and about 0.15 g/cc and an average dry basis weight of from about 0.01 g/cm 2 to about 0.04 g/cm 2 .
Claim 23
Dependent Claim 46 words
An absorbent structure, as in claim 19, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers and said storage layer comprises from about 15% to about 75% of said superabsorbent material, said superabsorbent material comprising discrete particles of absorbent gelling material.
Claim 24
Dependent Claim 46 words
An absorbent structure, as in claim 20, wherein said carrier means for said superabsorbent material comprises a web of cellulosic fibers and said storage layer comprises from about 15% to about 75% of said superabsorbent material, said superabsorbent material comprising discrete particles of absorbent gelling material.
Claim 25
Dependent Claim 14 words
An absorbent structure, as in claim 15, wherein said storage layer comprises superabsorbent fibers.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-06-07 1996-12-07 1997-06-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-06-07 2000-12-07 2001-06-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-06-07 2004-12-07 2005-06-08 $7700.00 Window Closed / Lapsed

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