US4778458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable sanitary absorbent incontinence pad
Assignee: Whitestone Products
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Filing: 1987-04-16
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Granted: 1988-10-18
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Expires: 2007-04-16
Abstract
Abstract A coverstock for disposable sanitary absorbent products is described. It comprises a non-woven web having a body-contacting surface and a material-contacting surface. The web is partially impregnated in selected areas with a fluid-repellent material such as a hot-melt adhesive. The penetration of the repellent material extends from the material-contacting surface, a distance toward the body-contacting surface at least 5% and not more than 95% of the thickness of the web so that the body-contacting surface is free of fluid-repellent material, and so that the material-contacting surface can be secured to the material by application of heat and without any additional adhesive material. A disposable absorbent pad made with the coverstock material, and the process for making the coverstock material and the pad are also disclosed.
Inventors
- 👤 David E. Gronostajski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:12
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/45; A61F13/49; A61F13/494; A61F13/49406; A61F13/49446; A61F13/15577; A61F13/15585; A61F13/49007; A61F13/49009; A61F13/49017; A61F13/51; A61F13/511; A61F13/51113; A61F13/513; A61F13/51305; A61F5/00; A61F5/44; A61F5/4401; A61F2013/51059; A61F2013/51061
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A pervious web cover-material for an absorbent, disposable, sanitary product, said web having a thickness and being impregnated with a fluid barrier material on only one side thereof, and said material penetrating into the interior of said web between about 5% to 95% but less than 100% of the web, said impregnated web being soft to the feel on the uncoated surface.
Claim 2
Dependent Claim
62 words
A pervious web cover-material for an absorbent, disposable, sanitary product, said web having a thickness and being impregnated with a fluid barrier material on only one side thereof, and said material penetrating into the interior of said web between about 5% to 95% but less than 100% of the web, said impregnated web being soft to the feel on the uncoated surface.
Claim 3
Dependent Claim
22 words
The web of claim 1 wherein the material is a hot melt material of an amorphous polypropylene base or other suitable material.
Claim 4
Dependent Claim
31 words
The web of claim 1 wherein the hot melt adhesive not only functions as a liquid impervious barrier, but also as an adhesive seal for the nonwoven to the adjacent substrates.
Claim 5
Dependent Claim
58 words
A disposable sanitary absorbent pad having an absorbent core and a pervious cover, said cover being partially impregnated with a fluid barrier, said cover overlying said core with a portion of the barrier in contact with the core wherein the barrier penetrates the cover no more than 95% but less than 100% of the thickness of the cover.
Claim 6
Dependent Claim
58 words
A disposable sanitary absorbent pad having an absorbent core and a pervious cover, said cover being partially impregnated with a fluid barrier, said cover overlying said core with a portion of the barrier in contact with the core wherein the barrier penetrates the cover no more than 95% but less than 100% of the thickness of the cover.
Claim 7
Dependent Claim
18 words
The pad of claim 4 wherein the barrier is a hot melt material of an amorphous polypropylene base.
Claim 8
Dependent Claim
147 words
The process of creating in a pervious non-woven web a portion thereof which is impervious, said process including the step of unwinding a web of non-woven material, applying a quantity of barrier material on selected portions of said web, controlling the quantity of the barrier material so that it penetrates no more than 95% but less than 100% of the thickness of the said web of non-woven material, said controlling including passing the said web over at least one metal jacketed cooling surface so as to cause said barrier material to set before it penetrates fully the thickness of the said web, said controlling to include leaving a thin layer of tacky impregnate available for bonding to substrate materials, said controlling including passing the constructed web over a series of relieved metal or compressable plastic compression rolls to effect nonadherence of an elastic thread to the impregnate.
Claim 9
Dependent Claim
147 words
The process of creating in a pervious non-woven web a portion thereof which is impervious, said process including the step of unwinding a web of non-woven material, applying a quantity of barrier material on selected portions of said web, controlling the quantity of the barrier material so that it penetrates no more than 95% but less than 100% of the thickness of the said web of non-woven material, said controlling including passing the said web over at least one metal jacketed cooling surface so as to cause said barrier material to set before it penetrates fully the thickness of the said web, said controlling to include leaving a thin layer of tacky impregnate available for bonding to substrate materials, said controlling including passing the constructed web over a series of relieved metal or compressable plastic compression rolls to effect nonadherence of an elastic thread to the impregnate.
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |