Patent US4537590A successfully refreshed from Google Patents.
US4537590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superthin absorbent product
Assignee: Personal Products Co
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Filing: 1983-06-20
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Granted: 1985-08-27
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Expires: 2003-06-20
Abstract
Abstract A superthin absorbent disposable product is provided having an absorbing layer containing superabsorbent and a wicking layer. The product is suitable for use in disposable diapers, sanitary napkins, incontinent pads, wipes and the like.
Inventors
- 👤 Heinz A. Pieniak
- 👤 Michael J. Iskra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:38
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2051; A61F13/206; A61F13/53; A61F13/534; A61F13/537; A61F13/53708; A61F13/53717; A61F13/53743; A61F13/53756; B32B5/00; B32B5/02; B32B5/022; B32B5/22; B32B5/24; B32B5/26; A61F13/2002; A61F13/202; A61F13/56; A61F13/58; A61F2013/15008; A61F2013/15048; A61F13/51; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/530131; A61F2013/530226; A61F2013/530299; A61F2013/530306; A61F2013/530335; A61F2013/530379; A61F2013/53043; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/583; B32B2250/00; B32B2250/40; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2432/00; B32B2555/00; B32B2555/02
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
187 words
An absorbent compressed composite laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed intermittently throughout said first layer, said particles or globules being present in at least about 200 percent dry-add-on basis, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate being compressed to substantially reduce its thickness.
Claim 2
Dependent Claim
187 words
An absorbent compressed composite laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed intermittently throughout said first layer, said particles or globules being present in at least about 200 percent dry-add-on basis, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate being compressed to substantially reduce its thickness.
Claim 3
Dependent Claim
21 words
The compressed composite laminate of claim 1 wherein said first layer is comprised of a nonwoven web of synthetic staple fibers.
Claim 4
Dependent Claim
15 words
The compressed composite laminate of claim 2 wherein the nonwoven web is comprised of polyester.
Claim 5
Dependent Claim
22 words
The compressed composite laminate of claim 1 wherein the thickness of the composite is less than one-half its thickness in uncompressed form.
Claim 6
Dependent Claim
19 words
The compressed composite laminate of claim 1 wherein said second layer is comprised of chemically delignified wood pulp fibers.
Claim 7
Dependent Claim
16 words
The compressed composite laminate of claim 1 wherein said second layer is comprised of peat moss.
Claim 8
Dependent Claim
35 words
The compressed composite laminate of claim 1 wherein the superabsorbent material is present in an amount from about 200 percent to about 1,500 percent, dry weight, based on the dry weight of said fibrous web.
Claim 9
Dependent Claim
166 words
An absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 10
Dependent Claim
166 words
An absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 11
Dependent Claim
19 words
The compressed composite laminate of claim 8 wherein said first fibrous layer is comprised of a nonwoven fibrous web.
Claim 12
Dependent Claim
17 words
The compressed composite laminate of claim 9 wherein said nonwoven fibrous web is comprised of polyester fibers.
Claim 13
Dependent Claim
36 words
The compressed composite laminate of claim 8 wherein the superabsorbent material is present in an amount from about 200 percent to about 1500 percent dry weight based on the dry weight of said fibrous first layer.
Claim 14
Dependent Claim
19 words
The compressed composite laminate of claim 8 wherein said second layer is comprised of chemically delignified wood pulp fibers.
Claim 15
Dependent Claim
16 words
The compressed composite laminate of claim 8 wherein said second layer is comprised of peat moss.
Claim 16
Dependent Claim
16 words
The compressed composite laminate of claim 8 wherein said second layer is comprised of rayon fibers.
Claim 17
Dependent Claim
128 words
An absorbent compressed composite laminate comprising an absorbing layer, a transition zone, and a wicking layer, said absorbing layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an intitial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 , said wicking layer comprising particles selected from the group consisting of cellulosic fibers, peat moss,rayon fibers, and mixtures thereof, some of said particles extending into and becoming integral with said absorbing layer to provide said transition zone, said absorbing layer having interspersed therein cuperabsorbent material present in an amount between about 200 percent and 1,500 percent dry weight basis based on said fibrous web dry weight basis, said composite in its compressed form.
Claim 18
Dependent Claim
128 words
An absorbent compressed composite laminate comprising an absorbing layer, a transition zone, and a wicking layer, said absorbing layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an intitial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 , said wicking layer comprising particles selected from the group consisting of cellulosic fibers, peat moss,rayon fibers, and mixtures thereof, some of said particles extending into and becoming integral with said absorbing layer to provide said transition zone, said absorbing layer having interspersed therein cuperabsorbent material present in an amount between about 200 percent and 1,500 percent dry weight basis based on said fibrous web dry weight basis, said composite in its compressed form.
Claim 19
Dependent Claim
21 words
The compressed composite laminate of claim 15 wherein said fibrous web is comprised of a nonwoven fabric of synthetic staple fibers.
Claim 20
Dependent Claim
16 words
The compressed composite laminate of claim 16 wherein the nonwoven fabric is comprised of polyester fibers.
Claim 21
Dependent Claim
19 words
The compressed composite laminate of claim 15 wherein said wicking layer is comprised of chemically delignified wood pulp fibers.
Claim 22
Dependent Claim
16 words
The compressed composite laminate of claim 15 wherein said wicking layer is comprised of peat moss.
Claim 23
Dependent Claim
35 words
The compressed composite laminate of claim 15 wherein said superabsorbent material is present in an amout from about 400 percent to about 1,200 percent dry weight basis based on said fibrous web dry weight basis.
Claim 24
Dependent Claim
154 words
A disposable diaper containing an absorbent pad wherein said absorbent pad is comprised of an absorbent compressed composite laminate comprising an absorbing layer, a transition zone, and a wicking layer, said absorbing layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 , said wicking layer comprising hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, some of said particles extending into and becoming integral with said absorbing layer to provide said transition zone, said absorbing layer having interspersed therein superabsorbent material present in an amount between about 200 percent and 1,500 percent dry weight basis based on said fibrous web dry weight basis, said composite in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 25
Dependent Claim
154 words
A disposable diaper containing an absorbent pad wherein said absorbent pad is comprised of an absorbent compressed composite laminate comprising an absorbing layer, a transition zone, and a wicking layer, said absorbing layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 , said wicking layer comprising hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, some of said particles extending into and becoming integral with said absorbing layer to provide said transition zone, said absorbing layer having interspersed therein superabsorbent material present in an amount between about 200 percent and 1,500 percent dry weight basis based on said fibrous web dry weight basis, said composite in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 26
Dependent Claim
20 words
The disposable diaper of claim 21 wherein said absorbent pad is comprised of two or more absorbent compressed composite laminates.
Claim 27
Dependent Claim
34 words
The disposable diaper of claim 21 wherein said compressed composite laminate is comprised of a polyester nonwoven web and the wicking layer of said compressed composite is comprised of chemically delignified wood pulp fibers.
Claim 28
Dependent Claim
22 words
The disposable diaper of claim 21 wherein said compressed composite laminate is comprised of an absorbing layer sandwiched between two wicking layers.
Claim 29
Dependent Claim
180 words
A disposable diaper containing an absorbent pad wherein said absorbent pad is comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed for with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide perferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 30
Dependent Claim
180 words
A disposable diaper containing an absorbent pad wherein said absorbent pad is comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed for with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide perferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 31
Dependent Claim
204 words
A sanitary napkin containing an absorbent structure partially encompassed by a liquid barrier with a moisture-permeable overwrap, said absorbent structure being comprised of a disposable absorbent compressed composite laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 32
Dependent Claim
204 words
A sanitary napkin containing an absorbent structure partially encompassed by a liquid barrier with a moisture-permeable overwrap, said absorbent structure being comprised of a disposable absorbent compressed composite laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 33
Dependent Claim
28 words
The sanitary napkin of claim 26 wherein said absorbent structure comprises two compressed composite laminates superimposed one upon the other with the absorbing layers immediately adjacent one another.
Claim 34
Dependent Claim
179 words
A sanitary napkin containing an absorbent structure, said absorbent structure being comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 35
Dependent Claim
179 words
A sanitary napkin containing an absorbent structure, said absorbent structure being comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 36
Dependent Claim
191 words
A tampon having as its absorbent portion an absorbent compressed composite laminate said laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said particles or globules being of a size and spacing whereby said particles do not interfere with the absorption of liquid by adjacent particles, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 37
Dependent Claim
191 words
A tampon having as its absorbent portion an absorbent compressed composite laminate said laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coextensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said particles or globules being of a size and spacing whereby said particles do not interfere with the absorption of liquid by adjacent particles, said second layer comprising substantially uniformly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 38
Dependent Claim
24 words
The tampon of claim 29 whrein said compressed composite laminate is comprised of two wicking layers one on each side of an absorbing layer.
Claim 39
Dependent Claim
184 words
A tampon containing an absorbent structure said absorbent structure being comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer prior to incorporation of the superabsorbent therein, to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 40
Dependent Claim
184 words
A tampon containing an absorbent structure said absorbent structure being comprised of an absorbent compressed composite laminate comprising: a first fibrous layer having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer prior to incorporation of the superabsorbent therein, to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to incorporation of the superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 41
Dependent Claim
196 words
A wipe comprising a nonwoven fabric as a substrate having affixed thereto a disposable absorbent compressed composite laminate said laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coxtensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said second layer comprising substantially uniformly randomly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 42
Dependent Claim
196 words
A wipe comprising a nonwoven fabric as a substrate having affixed thereto a disposable absorbent compressed composite laminate said laminate comprising a first layer, a second layer, and a transition zone integrally and intimately connecting said first and second layers and being substantially coxtensive therewith, said first layer comprising a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight less than about 2 oz/yd 2 , and a plurality of particles or globules of superabsorbent material disposed substantially throughout said first layer, said second layer comprising substantially uniformly randomly disposed, frictionally engaged hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, said particles being sufficiently closely spaced to adjacent particles to promote rapid movement of liquid along the plane of said layer, and said transition zone comprising portions of said engaged particles extending into and becoming integral with said first layer with portions of said engaged particles in intimate contact with said superabsorbent material, said composite laminate in its compressed form being less than one-half its thickness in an uncompressed form.
Claim 43
Dependent Claim
174 words
A wipe comprising a nonwoven fabric having affixed thereto an absorbent compressed composite laminate comprising: a first fibrous laver having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 44
Dependent Claim
174 words
A wipe comprising a nonwoven fabric having affixed thereto an absorbent compressed composite laminate comprising: a first fibrous laver having a given thickness dimension in uncompressed form, superabsorbent material within said first layer and cooperating with the fibers of said first layer to retain said first layer in a compressed form with a thickness dimension less than said given thickness dimension; and a second layer discrete from but united to said first layer, said second layer having no superabsorbent material therewithin and being denser than said first layer prior to the incorporation of superabsorbent therein, to provide preferential wicking of liquid within said second layer, whereby liquid wetted upon said composite in a given area is transported in said second layer away from said given area and distributed to portions of said first layer remote from said given area, said superabsorbent material upon swelling permitting said first fibrous layer to expand from said compressed form upon absorption of liquid in said superabsorbent material to thereby provide increased liquid holding capacity within said first layer.
Claim 45
Independent Claim
122 words
A method for forming an absorbent compressed composite laminate comprising forming a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 ; interspersing therein superabsorbent material in an amount between about 200 percent and about 1,500 percent, dry weight basis, based on said fibrous web dry weight basis to form an absorbing layer; contacting a wicking layer comprised of hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, with one surface of said absorbing layer and, compressing said layers sufficiently to reduce the thickness thereof by at least 50 percent.
Claim 46
Independent Claim
122 words
A method for forming an absorbent compressed composite laminate comprising forming a fibrous web having a dry bulk recovery of at least about 30 percent, an initial dry bulk of at least about 20 cc/gm, and a weight of less than about 2 oz/yd 2 ; interspersing therein superabsorbent material in an amount between about 200 percent and about 1,500 percent, dry weight basis, based on said fibrous web dry weight basis to form an absorbing layer; contacting a wicking layer comprised of hydrophilic particles selected from the group consisting of cellulosic fibers, peat moss, rayon fibers and mixtures thereof, with one surface of said absorbing layer and, compressing said layers sufficiently to reduce the thickness thereof by at least 50 percent.
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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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |