US4676784A
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: 1987-06-30
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Expires: 2004-05-01
Abstract
Abstract An absorbent product is provided which is disposable, light weight, stable and potentially thin. It is comprised of a superstructure of resilient fibers in combination with superabsorbent, which combination is provided with apertures. The apertures and at least one side of the superstructure are covered with hydrophilic material.
Inventors
- 👤 Edward P. Erdman
- 👤 Heinz A. Pieniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/531; A61F13/532; A61F13/5323; A61F13/534; A61F13/537; A61F13/539; A61F2013/530131; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/53051; A61F2013/5395
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
An absorbent product comprising a fibrous superstructure comprising from about 10 percent to about 80 percent by weight of resilient fibers and from about 20 percent to about 90 percent by weight superabsorbent, said superstructure having apertures with one dimension at least about 0.25 inch, and a lightly compacted hydrophilic porous material covering at least one side of said superstructure said covering material providing a capillary pressure to absorbed liquid that is higher than the superstructure.
Claim 2
Dependent Claim
76 words
An absorbent product comprising a fibrous superstructure comprising from about 10 percent to about 80 percent by weight of resilient fibers and from about 20 percent to about 90 percent by weight superabsorbent, said superstructure having apertures with one dimension at least about 0.25 inch, and a lightly compacted hydrophilic porous material covering at least one side of said superstructure said covering material providing a capillary pressure to absorbed liquid that is higher than the superstructure.
Claim 3
Dependent Claim
21 words
An absorbent product in accordance with claim 1 wherein said superstructure is a fibrous web of wet and dry resilient fibers.
Claim 4
Dependent Claim
16 words
An absorbent structure in accordance with claim 2 wherein said fibrous web is a non-woven web.
Claim 5
Dependent Claim
16 words
An absorbent product in accordance with claim 3 wherein said non-woven web is a polyester web.
Claim 6
Dependent Claim
33 words
An absorbent product in accordance with claim 1 wherein said hydrophilic porous material is selected from the group consisting of open-cell foam, styrofoam beads, cellulosic fibers, peat moss, acrylic fibers and mixtures thereof.
Claim 7
Dependent Claim
23 words
An absorbent product in accordance with claim 5 wherein said cellulosic fibers are wood pulp fibers, cotton linters, rayon fibers, or mixtures thereof.
Claim 8
Dependent Claim
23 words
An absorbent structure in accordance with claim 1 wherein said superabsorbent is present in an amount of at least about 200% by weight.
Claim 9
Dependent Claim
20 words
An absorbent product in accordance with claim 1 containing a wicking layer on at least one side of said superstructure.
Claim 10
Dependent Claim
17 words
An absorbent product in accordance with claim 8 wherein said wicking layer is a layer of tissue.
Claim 11
Dependent Claim
20 words
An absorbent structure in accordance with claim 8 wherein said wicking layer is a layer of compressed wood pulp fibers.
Claim 12
Dependent Claim
77 words
A disposable diaper comprising a moisture-impermeable backing and a moisture-permeable facing, said backing and said facing having sandwiched therebetween an absorbent product of a substantially stable, flexible, absorbent fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.
Claim 13
Dependent Claim
77 words
A disposable diaper comprising a moisture-impermeable backing and a moisture-permeable facing, said backing and said facing having sandwiched therebetween an absorbent product of a substantially stable, flexible, absorbent fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.
Claim 14
Dependent Claim
71 words
A sanitary napkin comprising an absorbent product partially encompassed by a liquid barrier, said absorbent product comprising a substantially stable, flexible, absorbent, fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.
Claim 15
Dependent Claim
71 words
A sanitary napkin comprising an absorbent product partially encompassed by a liquid barrier, said absorbent product comprising a substantially stable, flexible, absorbent, fibrous superstructure of resilient fibers containing at least about 20% by weight of superabsorbent and having openings and a layer of a hydrophilic porous material covering at least one side of said superstructure, said layer providing a capillary pressure to absorbed liquid higher than that provided by said superstructure.
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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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |