Patent US4364992A successfully refreshed from Google Patents.
US4364992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two layer absorbent article with super water-absorbing polymer
Assignee: Kao Corp
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Filing: 1981-06-12
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Granted: 1982-12-21
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Expires: 2001-06-12
Abstract
Abstract An absorbent article comprising an upper, first, absorbing layer formed so that its density under a load of 35 g/cm 2 is lower than 0.045 g/cm 3 both in the dry state and in the wet state and the weight per square meter is 15 to 50 g, and a lower, second, absorbing layer having a super water-absorbing polymer fixed thereto.
Inventors
- 👤 Osamu Ito
- 👤 Kazunori Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:02
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L15/42; A61L15/60; A61F2013/530481; A61F2013/53445; Y; Y10; Y10S; Y10S604/00; Y10S604/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An absorbent article, comprising: an upper, first, absorbing layer having a density, in both the dry state and the wet state, of less than 0.045 g/cm 3 when measured under a load of 35 g/cm 2 , wherein the density in the wet state does not include the density of absorbed liquid, said first absorbing layer weighing from 15 to 50 g/m 2 , said first absorbing layer being a felt made of bonded fibrous webs and being comprised of from 30 to 60% by weight of hollow polyester fibers and from 30 to 50% by weight of heat-fusible fibers; and a lower, second, absorbing layer having a super water-absorbing polymer fixed thereto.
Claim 2
Dependent Claim
113 words
An absorbent article, comprising: an upper, first, absorbing layer having a density, in both the dry state and the wet state, of less than 0.045 g/cm 3 when measured under a load of 35 g/cm 2 , wherein the density in the wet state does not include the density of absorbed liquid, said first absorbing layer weighing from 15 to 50 g/m 2 , said first absorbing layer being a felt made of bonded fibrous webs and being comprised of from 30 to 60% by weight of hollow polyester fibers and from 30 to 50% by weight of heat-fusible fibers; and a lower, second, absorbing layer having a super water-absorbing polymer fixed thereto.
Claim 3
Dependent Claim
35 words
An absorbent article as claimed in claim 1, wherein said hollow, polyester fibers have a fineness of from about 6 to about 12 denier and said heat-fusible fibers have a fineness of about 3 denier.
Claim 4
Dependent Claim
28 words
An absorbent article as claimed in claim 1 or claim 2 in which said super water-absorbing polymer is a powder of a polymer of an acrylic acid derivative.
Claim 5
Dependent Claim
44 words
An absorbent article as claimed in claim 1 or claim 2, in which said super water-absorbing polymer is a powder fixed between two water-absorbing sheets, said super water-absorbing polymer being capable of absorbing water in an amount at least 10 times its own weight.
Claim 6
Dependent Claim
36 words
An absorbent article as claimed in claim 1 in the form of a sheet wherein the sum of the weights of said first layer and said second layer is from about 12 to about 14 g/sheet.
Claim 7
Dependent Claim
18 words
An absorbent article as claimed in claim 1 wherein said density is lower than 0.03 g/cm 3 .
Claim 8
Dependent Claim
22 words
An absorbent article as claimed in claim 1 wherein said first absorbing layer covers the entire surface of said second absorbing layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |