Patent US4735843A successfully refreshed from Google Patents.
US4735843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively surface-hydrophilic porous or perforated sheets
Assignee: Procter and Gamble Co
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Filing: 1986-12-18
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Granted: 1988-04-05
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Expires: 2006-12-18
Abstract
Abstract Surface-hydrophilic perforated sheets comprise a fluid-permeable hydrophobic sheet having a multiplicity of holes for fluid passage. The sheets are coated with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties, whereby the surface of the sheet is rendered hydrophilic. The sheets are particularly useful as cover sheets for absorbent structures such as diapers, bandages, and catamenials.
Inventors
- 👤 Isao Noda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:21
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/511; A61F13/512; A61F13/51104; A61F13/513; A61F13/51305; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61F13/51113; A61F2013/51059; A61F2013/51066; A61F13/53; A61F13/534; A61F2013/53445; Y; Y10; Y10S; Y10S525/00; Y10S525/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/31504; Y10T428/31725; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
67 words
A selectively surface-hydrophilic article comprising a fluid permeable hydrophobic sheet having a multiplicity of holes or channels for fluid passage and having a fluid-directed front face and a back-face, said back-face of said sheet being substantially coated with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties, whereby the back-face of said sheet is rendered hydrophilic and the front face of said sheet remains hydrophobic.
Claim 2
Dependent Claim
67 words
A selectively surface-hydrophilic article comprising a fluid permeable hydrophobic sheet having a multiplicity of holes or channels for fluid passage and having a fluid-directed front face and a back-face, said back-face of said sheet being substantially coated with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties, whereby the back-face of said sheet is rendered hydrophilic and the front face of said sheet remains hydrophobic.
Claim 3
Dependent Claim
12 words
A sheet according to claim 1 which comprises a hydrophobic polymer film.
Claim 4
Dependent Claim
16 words
A sheet according to claim 2 which has a thickness of no greater than 3 millimeters.
Claim 5
Dependent Claim
21 words
A sheet according to claim 3 in which the holes each have an average area no greater than 2 square millimeters.
Claim 6
Dependent Claim
21 words
A sheet according to claim 5 wherein the average area of the holes is from about 0.001 to 1 square millimeters.
Claim 7
Dependent Claim
16 words
A sheet according to claim 5 which is a polyethylene, polypropylene, polyvinylchloride, polyamide or polyester film.
Claim 8
Dependent Claim
73 words
An absorbent article comprising: a. a fluid-retaining core, said core having a fluid-receiving surface; b. a fluid-permeable sheet comprising a multiplicity of holes or channels for fluid passage to said core, said sheet having a hydrophobic fluid-directed front face and a back face which adjoins the fluid-receiving surface of said core, said back face being surface-hydrophilic by virtue of a coating of a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
Claim 9
Dependent Claim
73 words
An absorbent article comprising: a. a fluid-retaining core, said core having a fluid-receiving surface; b. a fluid-permeable sheet comprising a multiplicity of holes or channels for fluid passage to said core, said sheet having a hydrophobic fluid-directed front face and a back face which adjoins the fluid-receiving surface of said core, said back face being surface-hydrophilic by virtue of a coating of a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
Claim 10
Dependent Claim
26 words
An absorbent article according to claim 7 wherein the absorbent core comprises a fibrous material, a gelling agent for the fluid being absorbed, or mixtures thereof.
Claim 11
Dependent Claim
45 words
An absorbent article according to claim 8 wherein said fluid-permeable sheet comprises a polymer film having a thickness of from 0.01 mm to 0.2 mm, said film being provided with a multiplicity of holes having an average diameter of from 0.1 mm to 1 mm.
Claim 12
Dependent Claim
19 words
An absorbent article according to claim 9 wherein said holes are of a round, ovoid or truncated conical shape.
Claim 13
Dependent Claim
9 words
A diaper or incontinence garment according to claim 8.
Claim 14
Dependent Claim
6 words
A catamenial according to claim 8.
Claim 15
Dependent Claim
9 words
A bandage or incontinence pad according to claim 8.
Claim 16
Independent Claim
43 words
A method for enhancing fluid passage through a fluid-permeable sheet while reducing re-wet, comprising maintaining the fluid-directed front face of said sheet hydrophobic and coating the back face of said sheet with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
Claim 17
Independent Claim
43 words
A method for enhancing fluid passage through a fluid-permeable sheet while reducing re-wet, comprising maintaining the fluid-directed front face of said sheet hydrophobic and coating the back face of said sheet with a rubber-like material insoluble in aqueous fluid but having surface-hydrophilic properties.
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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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |