US5763335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material for absorbing and dissipating body fluids and moisture
Assignee: HH Brown Shoe Technologies Inc
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Filing: 1996-05-21
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Granted: 1998-06-09
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Expires: 2016-05-21
Abstract
Abstract Layered composite materials adapted to be formed into predetermined shaped components disposed for contact with moisture and body fluids having a cover layer for contact with the moisture and body fluids and a foam layer including one or more sorbents in a hydrophilic polyurethane foam matrix, wherein the foam layer is bonded to the cover layer so that moisture and body fluids in contact with the cover layer are transferred through the cover layer to the foam layer. The foam layer is established by combining an aqueous mixture including the sorbent in a predetermined ratio with the hydrophilic polyurethane. The foam layer may include other active ingredients such as odor absorption and bactericidal components, thermal phase change components and finely ground rubber tire materials to vary the characteristics of the composite material. Additionally, citric acid and surfactant compounds may be used to increase the concentration of the sorbent in the aqueous mixture and maintain the pumping fluidity of the aqueous mixture. Methods for making the layered composite materials are also described.
Inventors
- 👤 Paul F. Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:25
CPC Classifications
A; A43; A43B; A43B17/00; A43B17/10; A43B17/102; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5663; B32B37/00; B32B5/18; B32B5/32; B32B7/00; B32B7/04; B32B7/12; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/02; B32B2305/022; B32B2305/10; B32B2305/20; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/651; Y10T442/659; Y10T442/666; Y10T442/667
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A layered composite material adapted to be formed into predetermined shaped components disposed for contact with moisture and body fluids comprising: a cover layer for contact with said moisture and body fluids; a foam layer hydrophilic with respect to said cover layer comprising one or more sorbents and a thermoformable acrylic latex in a hydrophilic polyurethane foam matrix, wherein a first side of said foam layer is bonded to said cover layer so that moisture or body fluids in contact with said cover layer are transferred through said cover layer to said foam layer.
Claim 2
Dependent Claim
94 words
A layered composite material adapted to be formed into predetermined shaped components disposed for contact with moisture and body fluids comprising: a cover layer for contact with said moisture and body fluids; a foam layer hydrophilic with respect to said cover layer comprising one or more sorbents and a thermoformable acrylic latex in a hydrophilic polyurethane foam matrix, wherein a first side of said foam layer is bonded to said cover layer so that moisture or body fluids in contact with said cover layer are transferred through said cover layer to said foam layer.
Claim 3
Dependent Claim
18 words
The layered composite material of claim 1, wherein said cover layer comprises a randomly oriented polyester fiber material.
Claim 4
Dependent Claim
15 words
The layered composite material of claim 1, wherein said cover layer comprises sock liner material.
Claim 5
Dependent Claim
40 words
The layered composite material of claim 1, wherein said foam layer further includes one or more additives selected from a group consisting of absorptive fillers, fibrous materials, surfactants, odor absorbents, bactericides, pH buffers, rubber particles and thermal phase change particles.
Claim 6
Dependent Claim
26 words
The layered composite material of claim 4, wherein said odor absorption materials are selected from a group consisting of activated carbon, green tea and zinc oxide.
Claim 7
Dependent Claim
25 words
The layered composite material of claim 1, wherein said one or more sorbents are selected from the group consisting of absorbent polymers, clays and desiccants.
Claim 8
Dependent Claim
33 words
The layered composite material of claim 6, wherein said one or more sorbents include an absorbent polymer selected from the group consisting of sodium polyacrylates, sodium polyalcohols, polyethylene oxides and sodium carboxymethyl celluloses.
Claim 9
Dependent Claim
29 words
The layered composite material of claim 1, further including a third layer of non-woven material bonded to a second side of said foam layer remote from said cover layer.
Claim 10
Dependent Claim
22 words
The layered composite material of claim 8, wherein said third layer comprises a non-woven fiber web or felted non-woven fiber web material.
Claim 11
Dependent Claim
23 words
The layered composite material of claim 9, wherein said non-woven material is a thermoformable polyester non-woven material having fibers coated with acrylic resin.
Claim 12
Dependent Claim
12 words
A molded article thermoformed from the layered composite material of claim 10.
Claim 13
Dependent Claim
11 words
The molded article of claim 11, thermoformed using radiofrequency heat energy.
Claim 14
Dependent Claim
34 words
The layered composite material of claim 8, wherein said foam layer is directly polymerized on said cover layer or on said third layer, or on both of said cover layer and said third layer.
Claim 15
Dependent Claim
20 words
The layered composite material of claim 1, wherein said foam layer is bonded to said cover layer by needle punching.
Claim 16
Dependent Claim
36 words
The layered composite material of claim 1, wherein said foam layer is bonded to said cover layer with an adhesive capable of transferring said moisture and body fluids from said cover layer to said foam layer.
Claim 17
Dependent Claim
21 words
The layered composite material of claim 1, wherein said foam layer is bonded to said cover layer by thermoplastic heat bonding.
Claim 18
Dependent Claim
18 words
The layered composite material of claim 16, wherein said thermoplastic heat bonding is radio frequency heat energy bonding.
Claim 19
Dependent Claim
20 words
The layered composite material of claim 1, wherein said foam layer is bonded to said cover layer by flame bonding.
Claim 20
Dependent Claim
18 words
The layered composite material of claim 1, wherein said foam layer is directly polymerized onto said cover layer.
Claim 21
Dependent Claim
12 words
A molded article thermoformed from the layered composite material of claim 1.
Claim 22
Dependent Claim
12 words
The molded article of claim 20, thermoformed using radio frequency heat energy.
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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) | 2001-06-08 | 2001-12-08 | 2002-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-08 | 2005-12-08 | 2006-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-08 | 2009-12-08 | 2010-06-09 | $7700.00 | Window Closed / Lapsed |