Patent US4908026A successfully refreshed from Google Patents.
US4908026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow distribution system for absorbent pads
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1986-12-22
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Granted: 1990-03-13
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Expires: 2006-12-22
Abstract
Abstract The invention provides a pad (12) having a flow zone control layer (28) adjacent the bodyside liner (14) of the pad. The flow zone control layer (28) is in contact with the absorbent (30) on its lower side and the inner surface of the bodyside liner (14) on the upper surface. The flow zone control member (28) is located only in the middle portion of the pad (12). The bodyside liner (14) is provided with perforations in the area (16) of the flow zone control layer (28) to aid in transfer of liquids to the flow zone control layer (28). The pad (12) as is conventional would be provided with an impervious backing member (22) on the side away from the body. The preferred flow zone material is a meltblown polymer and the preferred perforated cover is spunbonded polypropylene.
Inventors
- 👤 Corrine A. Sukiennik
- 👤 Mollie M. Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:26
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F13/53743; A61F13/53747; A61F13/15203; A61F13/45; A61F13/47; A61F13/472; A61F13/51; A61F13/511; A61F13/512; A61F13/5126; A61F13/53708; A61F13/53713; A61F13/53717; A61F13/5376; A61F13/513; A61F13/51305; A61F2013/15284; A61F2013/15487; A61F2013/15512; A61F2013/5128; A61F2013/51355; A61F2013/51372; A61F2013/53721; A61F2013/53765; A61F2013/53782; A61F13/84; A61F2013/8497
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
129 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are arranged in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids positioned between said liner and said backing member; and (d) flow zone control means for facilitating dispersion of body fluid along the length thereof before allowing said fluid to pass into said absorbent, said flow zone control means being positioned between said central area of said liner and said absorbent means, and said flow zone control means has a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 2
Dependent Claim
129 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are arranged in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids positioned between said liner and said backing member; and (d) flow zone control means for facilitating dispersion of body fluid along the length thereof before allowing said fluid to pass into said absorbent, said flow zone control means being positioned between said central area of said liner and said absorbent means, and said flow zone control means has a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 3
Dependent Claim
34 words
The absorbent article of claim 1 wherein said flow zone control means is a fibrous layer having a first surface in contact with said liner and a second surface in contact with said absorbent.
Claim 4
Dependent Claim
16 words
The absorbent article of claim 2 wherein said fibrous layer is formed of meltblown polymer fibers.
Claim 5
Dependent Claim
17 words
The absorbent article of claim 3 wherein said fibrous layer is a different color than said absorbent.
Claim 6
Dependent Claim
17 words
The absorbent article of claim 4 wherein said fibrous layer is a darker color than said absorbent.
Claim 7
Dependent Claim
41 words
The absorbent article of claim 1 wherein said flow zone control means is a layer of fibrous material which is located below said perforated central area of said liner and is spaced away from said longitudinal side edges of said liner.
Claim 8
Dependent Claim
31 words
The absorbent article of claim 1 wherein said flow zone control means is in direct contact with said absorbent and is spaced away from the longitudinal side edges of said absorbent.
Claim 9
Dependent Claim
147 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and wherein said first surface has a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 10
Dependent Claim
147 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and wherein said first surface has a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 11
Dependent Claim
21 words
The absorbent article of claim 8 wherein said flow zone control layer is distally spaced from the periphery of said liner.
Claim 12
Dependent Claim
22 words
The absorbent article of claim 8 wherein said flow zone control layer is distally spaced from the periphery of said absorbent means.
Claim 13
Dependent Claim
21 words
The absorbent article of claim 10 wherein said flow zone control layer is formed of meltblown polymer fibers and is hydrophilic.
Claim 14
Dependent Claim
38 words
The absorbent article of claim 8 wherein said liner contains a plurality of perforations arranged in a narrow strip approximate the longitudinal central axis of said article, said plurality of perforations extending to opposite ends of said article.
Claim 15
Dependent Claim
39 words
The absorbent article of claim 12 wherein said plurality of perforations cause a portion of said liner material to be displaced downward and extend into said flow zone control layer thereby facilitating passage of body fluid into said layer.
Claim 16
Dependent Claim
28 words
The absorbent article of claim 8 wherein said plurality of perforations create an open area of about 20 to 50% of the total surface area of said liner.
Claim 17
Dependent Claim
172 words
An absorbent pad comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer lying beneath said perforated central area of said liner and positioned in direct contract with both said liner and said absorbent, said flow zone control layer having a distinctive shape and a surface area smaller than the total surface area of said perforated portion of said liner, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and said flow zone control layer having a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 18
Dependent Claim
172 words
An absorbent pad comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer lying beneath said perforated central area of said liner and positioned in direct contract with both said liner and said absorbent, said flow zone control layer having a distinctive shape and a surface area smaller than the total surface area of said perforated portion of said liner, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and said flow zone control layer having a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 19
Dependent Claim
16 words
The absorbent pad of claim 15 wherein said flow zone control layer has an oval shape.
Claim 20
Dependent Claim
16 words
The absorbent pad of claim 15 wherein said flow zone control layer has an hourglass shape.
Claim 21
Dependent Claim
48 words
The absorbent pad of claim 16 wherein said flow zone control layer has an enlarged portion located at the longitudinal center of said pad and a pair of appropriately aligned triangular members extending outward from said enlarged portion, said members have a greater width at their distal ends.
Claim 22
Dependent Claim
19 words
The absorbent pad of claim 15 wherein said flow zone control layer is a different color than said liner.
Claim 23
Dependent Claim
159 words
An absorbent pad comprising: (a) a liquid pervious liner constructed of a spunbonded material and designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluid, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer constructed of a meltblown material having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and said flow zone control layer having a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 24
Dependent Claim
159 words
An absorbent pad comprising: (a) a liquid pervious liner constructed of a spunbonded material and designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluid, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer constructed of a meltblown material having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and said flow zone control layer having a coefficient of friction with said liner of between about 0.7 and 1.1.
Claim 25
Dependent Claim
145 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are arranged in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids positioned between said liner and said backing member; and (d) flow zone control means for facilitating dispersion of body fluid along the length thereof before allowing said fluid to pass into said absorbent, said flow zone control means being positioned between said central area of said liner and said absorbent means, and the coefficient of friction between said perforated liner and said flow zone control means is about 15 to 45% higher than the coefficient of friction between a non-perforated liner and said flow zone control means.
Claim 26
Dependent Claim
145 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are arranged in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids positioned between said liner and said backing member; and (d) flow zone control means for facilitating dispersion of body fluid along the length thereof before allowing said fluid to pass into said absorbent, said flow zone control means being positioned between said central area of said liner and said absorbent means, and the coefficient of friction between said perforated liner and said flow zone control means is about 15 to 45% higher than the coefficient of friction between a non-perforated liner and said flow zone control means.
Claim 27
Dependent Claim
167 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and the coefficient of friction between said perforated portion of said liner and said flow zone control layer is about 15 to 45% higher than the coefficient of friction between a non-perforated liner and said flow zone control layer.
Claim 28
Dependent Claim
167 words
An absorbent article comprising: (a) a liquid pervious liner designed to be positioned adjacent to the body of a wearer, said liner having a plurality of perforations extending completely therethrough which are formed in a central area and spaced away from the longitudinal side edges thereof; (b) a liquid-impermeable backing member; (c) absorbent means for absorbing body fluids, said absorbent means being positioned between said liner and said backing member; and (d) a flow zone control layer having a first surface in contact with said perforated central area of said liner and a second surface in contact with said absorbent, said flow zone control layer facilitating dispersion of body fluid along the length thereof before allowing a substantial amount of said fluid to pass into said absorbent means, and the coefficient of friction between said perforated portion of said liner and said flow zone control layer is about 15 to 45% higher than the coefficient of friction between a non-perforated liner and said flow zone control layer.
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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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |