US4985298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent nonwoven webs
Assignee: 3M Co
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Filing: 1989-10-02
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Granted: 1991-01-15
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Expires: 2009-10-02
Abstract
Abstract Highly absorbent nonwoven webs formed from readily available nonwoven materials and having a polyelectrolyte super-absorbent polymeric sorbent coating the individual fibers of the nonwoven web are disclosed. The polymeric sorbent coating absorbs liquid while minimizing occlusion of the interstices of the web.
Inventors
- 👤 Lee A. Buckley
- 👤 Thomas I. Insley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:11
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/15203; A61F13/539; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F2013/530131; A61F2013/530182; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/530569; A61F2013/530583; A61F2013/530613; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/603; Y10T442/607; Y10T442/696
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
An absorbent porous web comprising a nonwoven fibrous three dimensional network of staple fibers, said fibers having a thin but continuous in situ cured coating of a super-absorbent polymeric sorbent thereon, said fibrous network being unified by said polymeric coating essentially only at the crossing points of said fibers such that said polymeric coating is not readily discernible within the interstices of the web even upon microscopic examination thereof, said polymeric coating, upon sorption of liquid, swelling with minimum occlusion of the interstices of the web.
Claim 2
Dependent Claim
86 words
An absorbent porous web comprising a nonwoven fibrous three dimensional network of staple fibers, said fibers having a thin but continuous in situ cured coating of a super-absorbent polymeric sorbent thereon, said fibrous network being unified by said polymeric coating essentially only at the crossing points of said fibers such that said polymeric coating is not readily discernible within the interstices of the web even upon microscopic examination thereof, said polymeric coating, upon sorption of liquid, swelling with minimum occlusion of the interstices of the web.
Claim 3
Dependent Claim
27 words
An absorbent porous web according to claim 1 wherein said polymeric coating on said fibers comprises from 35 to 80 weight percent of the total web weight.
Claim 4
Dependent Claim
24 words
An absorbent porous web according to claim 1 wherein said coating on said fibers comprises about 60 weight percent of the total web weight.
Claim 5
Dependent Claim
25 words
An absorbent porous web according to claim 1 having an absorption capacity of at least 20 grams of synthetic urine per gram of polymeric sorbent.
Claim 6
Dependent Claim
25 words
An absorbent porous web according to claim 3 having an absorption capacity of at least 40 grams of synthetic urine per gram of polymeric sorbent.
Claim 7
Dependent Claim
10 words
A diaper containing the absorbent porous web of claim 1.
Claim 8
Dependent Claim
12 words
A feminine hygiene product containing the absorbent porous web of claim 1.
Claim 9
Dependent Claim
11 words
An incontinent device containing the absorbent porous web of claim 1.
Claim 10
Dependent Claim
11 words
A wound dressing containing the absorbent porous web of claim 1.
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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |