US4645698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrating and water-retaining sheet
Assignee: Resonac Holdings Corp
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Filing: 1985-05-09
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Granted: 1987-02-24
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Expires: 2005-05-09
Abstract
Abstract A dehydrating and water-retaining sheet comprising a water-absorbing agent, a wetting agent having a water-absorbing property, and a water-permeable membrane, in which the water-absorbing agent and the wetting agent are at least partially wrapped together in the water-permeable membrane.
Inventors
- 👤 Mamoru Matsubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/264; Y; Y10; Y10S; Y10S34/00; Y10S34/01; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/239; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A dehydrating and water-retaining sheet comprising (a) a water-absorbing agent comprising a polymeric material capable of forming a hydrous gel, (b) a wetting agent having a water-absorbing property, and (c) a water-permeable membrane, in which the water-absorbing agent (a) and the wetting agent (b) are at least partially wrapped in the water-permeable membrane (c).
Claim 2
Dependent Claim
54 words
A dehydrating and water-retaining sheet comprising (a) a water-absorbing agent comprising a polymeric material capable of forming a hydrous gel, (b) a wetting agent having a water-absorbing property, and (c) a water-permeable membrane, in which the water-absorbing agent (a) and the wetting agent (b) are at least partially wrapped in the water-permeable membrane (c).
Claim 3
Dependent Claim
19 words
A sheet as set forth in claim 1, wherein the wetting agent (b) is supported by a water-permeable material.
Claim 4
Dependent Claim
29 words
A sheet as set forth in claim 2, wherein the water-permeable material is selected from the group consisting of paper, pulp sheet, woven fabric, knitted fabric, and non-woven fabric.
Claim 5
Dependent Claim
27 words
A sheet as set forth in claim 1, wherein the polymeric material capable of forming a hydrous gel is a tridimensional cross-linked product of a hydrophilic polymer.
Claim 6
Dependent Claim
26 words
A sheet as set forth in claim 1, wherein the wetting agent (b) is selected from the group consisting of hydrophilic polyhydric alcohols and hygroscopic polymers.
Claim 7
Dependent Claim
33 words
A sheet is set forth in claim 1, wherein the water-permeable membrane (c) is selected from the group consisting of paper, pulp sheet, woven fabaric, knitted fabric, non-woven fabric, and perforated plastic sheet.
References Cited (Backward Citations)
JPS5521203A
Cited
JPS5675054A
Cited
JPS57122914A
Cited
US4383376A
Cited
JPS57167734A
Cited
JPS58107133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |