Patent US4605401A successfully refreshed from Google Patents.
US4605401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for the absorption of water, aqueous solutions and aqueous body fluids
Assignee: Stockhausen GmbH and Co KG
•
Filing: 1984-05-25
•
Granted: 1986-08-12
•
Expires: 2004-05-25
Abstract
Abstract An absorption material is produced by applying directly to a support in the presence of liquid an absorbent which is at least partially water-softened, and drying to remove the liquid so as to leave the absorbent directly on the support. The support may be fibrous or particulate like sawdust or it may be a textile sheet or paper. The absorbent may be an acrylic based polymer. Because the absorbent directly contacts the support the product has increased absorptive capacity and is stronger, making it especially useful as a diaper, tampon, sanitary napkin, surgical dressing, battery separator and/or filter for cigarette smoke or for liquids.
Inventors
- 👤 Miroslav Chmelir
- 👤 Alois Kunschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:19
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A01; A01G; A01G24/00; A01G24/20; A01G24/22; A01G24/23; A01G24/30; A01G24/35; A01G24/40; A01G24/42; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A process for producing an absorption material comprising applying directly to a cellulosic fibrous support a suspension in a liquid of a water-insoluble cross-linked absorbent polymer or copolymer of acrylic, methacryclic or acrylamidomethylpropanesulfonic acid or of a salt thereof, or of acrylic amide or methacrylic amide with one another or with at least one of vinylpyrrolidone and vinyl acetate, and drying to remove the liquid so as to leave the absorbent directly on the support.
Claim 2
Dependent Claim
75 words
A process for producing an absorption material comprising applying directly to a cellulosic fibrous support a suspension in a liquid of a water-insoluble cross-linked absorbent polymer or copolymer of acrylic, methacryclic or acrylamidomethylpropanesulfonic acid or of a salt thereof, or of acrylic amide or methacrylic amide with one another or with at least one of vinylpyrrolidone and vinyl acetate, and drying to remove the liquid so as to leave the absorbent directly on the support.
Claim 3
Dependent Claim
19 words
The process according to claim 1, wherein the absorbent is applied as a water-containing suspension in an organic solvent.
Claim 4
Dependent Claim
19 words
The process according to claim 1, wherein the support is in the form of a web, sheet or plate.
Claim 5
Dependent Claim
10 words
An absorption material produced by the process of claim 3.
Claim 6
Dependent Claim
20 words
The process according to claim 1, wherein the support is a woven, knit or non-woven textile fabric or paper sheet.
Claim 7
Dependent Claim
10 words
An absorption material produced by the process of claim 5.
Claim 8
Dependent Claim
16 words
The process according to claim 1, wherein the support comprises fibrous material which is initially suspended.
Claim 9
Dependent Claim
39 words
The process according to claim 1, wherein the liquid comprises at least one member selected from the group consisting of methanol, ethanol, isopropanol, acetone, tetrahydrofuran, dioxane and glycerine having a water content of about 0.1 to 60% by volume.
Claim 10
Dependent Claim
10 words
An absorption material produced by the process of claim 1.
Claim 11
Dependent Claim
28 words
An absorption material according to claim 9, wherein the support comprises about 10 to 99.9 weight percent thereof and the absorbent about 90 to 0.1 weight percent thereof.
Claim 12
Dependent Claim
16 words
A diaper, tampon, sanitary napkin or surgical dressing comprising an absorption material according to claim 9.
Claim 13
Dependent Claim
24 words
The process according to claim 1, wherein the absorbent is a water-insoluble cross-linked polymer or copolymer of acrylic acid or of a salt thereof.
References Cited (Backward Citations)
US2905568A
Cited
US3670731A
Cited
US3922434A
Cited
US4071650A
Cited
US4062451A
Cited
US4310593A
Cited
US4293609A
Cited
DE3037507A1
Cited
DE3036415A1
Cited
US4338371A
Cited
US4424247A
Cited
US4413995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |