US3645836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-absorption fibrous materials and method of making the same
Assignee: GOLDFARB KENNETH S
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Filing: 1968-09-05
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Granted: 1972-02-29
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Expires: 1988-09-05
Abstract
Abstract A readily disposable water absorbent product, such as a diaper, bed napkin or catamenial device, and process of making the same, the product comprising a supporting sheet of cellulose fiber and a layer of dry, flexible fibers which on contact with 20 times their weight of water at 25* C. lose their fibrous character and form a soft plastic gel, said flexible fibers consisting essentially of a polysaccharide gum or starch and the weight ratio of said cellulose fibers to said gel-forming fibers being in the range of 20:1 to 1:1.
Inventors
- 👤 David Torr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; D21H5/2607; D21H5/2628; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/31; D21H23/00; D21H23/02; D21H23/04; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1084; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/668; Y10T442/697
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
31 words
A product as in claim 1, such as a disposable diaper, bed napkin or catamenial device, having a body-touching layer and an outer layer, said fibers being positioned between said layers.
Claim 2
Dependent Claim
12 words
A product as in claim 1 in which said fibers are nonaligned.
Claim 3
Dependent Claim
13 words
A product as in claim 1 in which said fibers are of guar.
Claim 4
Dependent Claim
27 words
Product as in claim 1 in which said soft plastic gel has a pH of about 5 to 8 and retains its water content under mechanical pressure.
Claim 5
Dependent Claim
12 words
Product as in claim 5 in which said gel-forming fibers are nonwoven.
Claim 6
Dependent Claim
91 words
A process for the manufacture of readily disposable water absorbent products which comprises the steps of forming a dry flexible fibrous material which fibrous material on contact with 20 times its weight of water at 25* C. loses its fibrous character rapidly and forms a soft plastic gel, and uniting said fibrous material with a supporting sheet of cellulose fibers in a weight ratio of said cellulose fibers to said fibrous material in the range of 20:1 to 1:1, said fibrous material consisting essentially of a polysaccharide gum or a starch.
Claim 7
Dependent Claim
48 words
A process as in claim 7 in which said dry flexible fibrous material is made by bringing an aqueous solution of said gum or starch into contact with a water-miScible nonsolvent therefor while agitating, and then drying the resulting fibrous precipitate to produce a dry flexible fibrous mass.
Claim 8
Dependent Claim
21 words
A process as in claim 8 in which said fibrous precipitate is dried in air at a temperature below 60* C.
Claim 9
Dependent Claim
29 words
A process as in claim 9 in which said uniting step forms a length of sheet material, said process including the step of cutting said length with individual diapers.
Claim 10
Dependent Claim
27 words
Process as in claim 7 in which said soft plastic gel has a pH of about 5 to 8 and retains its water content under mechanical pressure.
Claim 11
Dependent Claim
12 words
Process as in claim 11 in which said gel-forming fibers are nonwoven.
References Cited (Backward Citations)
US2477861A
Cited
US2688586A
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US3070095A
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US3078849A
Cited
US3114672A
Cited
US3347236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |