US4560372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable disposable absorbent structure
Assignee: Personal Products Co
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Filing: 1984-05-01
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Granted: 1985-12-24
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Expires: 2004-05-01
Abstract
Abstract A disposable absorbent product is provided in the form of a layered structure. A first fibrous layer of resilient fibers contains superabsorbent and is superposed on a layer of hydrophilic material. The layers are unpressed and slit followed by extrusion to open the slits to provide apertures. The structure is used as the absorbent core in diapers, sanitary napkins, wound dressings and the like.
Inventors
- 👤 Heinz A. Pieniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:41
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/531; A61F13/532; A61F13/534; A61F13/535; A61F13/536; A61F13/537; A61F13/53708; A61F2013/530131; A61F2013/530481; A61F2013/53721; A61F2013/53765; A61F2013/53782
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
An absorbent product comprising a layered structure, which structure is comprised of a first fibrous layer substantially of resilient fibers and containing at least about 10% by weight superabsorbent and a second layer of hydrophilic porous material, said layers being substantially coextensive superposed one on the other and subjected to at least about 200 psi pressure in the presence of from about 10% to about 50% moisture to form said structure, said structure being provided with longitudinally parallel slits in staggered rows, said slits being at least about 0.5 inch in length, said rows being from about 0.1 to about 0.5 inches apart, said slit structure being extended transversely to provide an apertured structure, and said apertured layered structure being sandwiched between a liquid-impermeable barrier and a liquid-permeable facing.
Claim 2
Dependent Claim
129 words
An absorbent product comprising a layered structure, which structure is comprised of a first fibrous layer substantially of resilient fibers and containing at least about 10% by weight superabsorbent and a second layer of hydrophilic porous material, said layers being substantially coextensive superposed one on the other and subjected to at least about 200 psi pressure in the presence of from about 10% to about 50% moisture to form said structure, said structure being provided with longitudinally parallel slits in staggered rows, said slits being at least about 0.5 inch in length, said rows being from about 0.1 to about 0.5 inches apart, said slit structure being extended transversely to provide an apertured structure, and said apertured layered structure being sandwiched between a liquid-impermeable barrier and a liquid-permeable facing.
Claim 3
Dependent Claim
24 words
An absorbent product in accordance with claim 1 wherein said first fibrous layer is substantially of fibers which are both wet and dry resilient.
Claim 4
Dependent Claim
16 words
An absorbent structure in accordance with claim 2 wherein said fibrous web is a nonwoven web.
Claim 5
Dependent Claim
23 words
An absorbent product in accordance with claim 3 wherein said nonwoven web is a polyester web comprising a minor portion of binder fibers.
Claim 6
Dependent Claim
17 words
An absorbent product in acordance with claim 3 wherein said nonwove web is comprised of bicomponent fibers.
Claim 7
Dependent Claim
32 words
An absorbent product in accordance with claim 1 wherein said hydrophilic porous material is selected from the group consisting of open-cell cellulosic foam, cellulosic fibers, peat moss, acrylic fibers and mixtures thereof.
Claim 8
Dependent Claim
22 words
An absorbent product in accordance with claim 6 wherein said cellulosic fibers are woodpulp fibers, cotton linters, rayon fibers or mixtures thereof.
Claim 9
Dependent Claim
30 words
An absorbent product in accordance with claim 1 wherein said superabsorbent is present in an amount from about 20% to about 90% of the weight of said first fibrous layer.
Claim 10
Dependent Claim
15 words
An absorbent product in accordance with claim 1 wherein said product is a disposable diaper.
Claim 11
Dependent Claim
15 words
An absorbent product in accordance with claim 1 wherein said product is a sanitary napkin.
Claim 12
Dependent Claim
15 words
An absorbent product in accordance with claim 1 wherein said product is a wound dressing.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |