Patent US4297410A successfully refreshed from Google Patents.
US4297410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent material
Assignee: Kao Corp
•
Filing: 1979-10-02
•
Granted: 1981-10-27
•
Expires: 1999-10-02
Abstract
Abstract An absorbent material companies a non-woven fabric including thermoplastic fibers, on which a highly absorbing, hydrophilic polymetric substance is scattered and which is thermally set.
Inventors
- 👤 Yoshimi Tsuchiya
- 👤 Masayuki Sagae
- 👤 Hiroshi Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:47
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/539; A61F13/01; A61F13/01008; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; A61F13/534; A61F2013/00089; A61F2013/00314; A61F2013/00323; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/00744; A61F2013/530481; A61F2013/53445; A61F2013/5395; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/692; Y10T442/693; Y10T442/697; Y10T442/699
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
An absorbent material consisting essentially of: a first, non-woven fabric, absorbent sheet consisting essentially of absorbent fibers capable of absorbing exudations from the human body and from 10 to 50% by weight of thermoplastic polyolefin fibers; a multitude of particles deposited on one surface of said first sheet so as to form a discrete layer of said particles on said one surface of said first sheet wherein said particles project upwardly above said one surface of said first sheet, said particles consisting essentially of hydrophilic polymeric substance capable of absorbing water in an amount at least 30 times the weight of said hydrophilic polymeric substance, said particles being meltadhered to said thermoplastic polyolefin fibers of said first sheet at the locations where said particles contact said thermoplastic polyolefin fibers, said absorbent material having been prepared by depositing said particles on said sheet and then heating said sheet to melt thermoplastic polyolefin fibers therein whereby to cause said particles to adhere to said thermoplastic polyolefin fibers.
Claim 2
Dependent Claim
165 words
An absorbent material consisting essentially of: a first, non-woven fabric, absorbent sheet consisting essentially of absorbent fibers capable of absorbing exudations from the human body and from 10 to 50% by weight of thermoplastic polyolefin fibers; a multitude of particles deposited on one surface of said first sheet so as to form a discrete layer of said particles on said one surface of said first sheet wherein said particles project upwardly above said one surface of said first sheet, said particles consisting essentially of hydrophilic polymeric substance capable of absorbing water in an amount at least 30 times the weight of said hydrophilic polymeric substance, said particles being meltadhered to said thermoplastic polyolefin fibers of said first sheet at the locations where said particles contact said thermoplastic polyolefin fibers, said absorbent material having been prepared by depositing said particles on said sheet and then heating said sheet to melt thermoplastic polyolefin fibers therein whereby to cause said particles to adhere to said thermoplastic polyolefin fibers.
Claim 3
Dependent Claim
52 words
An absorbent material as claimed in claim 1 including a second, non-woven fabric, absorbent sheet laminated on and adhered to said layer of particles and located on the opposite side of said layer from said first sheet, said second sheet extending substantially parallel with and being upwardly spaced from said first sheet.
Claim 4
Dependent Claim
31 words
An absorbent material as claimed in claim 1 or claim 2 in which said first, non-woven fabric, absorbent sheet has a unit weight of from 10 to 40 g/m 2 .
Claim 5
Dependent Claim
60 words
A process for preparing an absorbent material, which comprises the steps of: scattering particles of a highly absorbent, hydrophilic polymer substance capable of absorbing water in an amount at least 30 times the weight of the polymer substance onto a nonwoven absorbent fabric comprising polyolefin fibers and cellulose fibers and then heating said non-woven fabric to fix said particles thereon.
Claim 6
Dependent Claim
60 words
A process for preparing an absorbent material, which comprises the steps of: scattering particles of a highly absorbent, hydrophilic polymer substance capable of absorbing water in an amount at least 30 times the weight of the polymer substance onto a nonwoven absorbent fabric comprising polyolefin fibers and cellulose fibers and then heating said non-woven fabric to fix said particles thereon.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 4, in which the heating step is conducted at a temperature at which said polyolefin fibers are melted.
Claim 8
Dependent Claim
43 words
A process as claimed in claim 4, wherein said non-woven fabric consists of 10 to 50 wt. % of polyolefin fibers and 90 to 50 wt. % of cellulose fibers, said fabric having a unit weight of 10 to 40 g/cm 2 .
Claim 9
Dependent Claim
43 words
A process as claimed in claim 4 which comprises the additional steps of placing a sheet of absorbent paper on said non-woven fabric on which said particles of the highly absorbing, hydrophilic polymer substance have been scattered and heat pressing the resulting assembly.
References Cited (Backward Citations)
US3900378A
Cited
US4058124A
Cited
US3888256A
Cited
US3901236A
Cited
US4102340A
Cited
US3971379A
Cited
US4055180A
Cited
US4055184A
Cited
US4187342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |