US3919385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high fluid-holding fiber mass
Assignee: Tambrands Inc
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Filing: 1972-11-24
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Granted: 1975-11-11
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Expires: 1992-11-24
Abstract
Abstract Method of making alloy fibers having high fluid-holding capacity, the alloy fibers being comprised of a matrix of nonderivatized regenerated cellulose having regenerated cyanoethyl cellulose and polyvinylpyrrolidone uniformly dispersed therein.
Inventors
- 👤 Frederick R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:33
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2082; A61F13/2085; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01F6/00; D01F6/44; D01F6/56; A61F13/2002; A61F13/202; A61F13/53; A61F2013/530131; A61F2013/530481; A61F2013/530489; A61F2013/530496
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A METHOD FOR MAKING FLUID ABSORBENT ALLOY FIBERS COMPRISING MIXING A CYANOETHYLATED VISCOSE AND AN AQUEOUS SOLUTION OF POLYVINYLPYRROLIDONE WITH A NON-DERIVATIZED, FILAMENTFORMING VISCOSE, THE LATTER OF WHICH CONSTITUENTS THE MAJOR PORTION OF THE MIXTURE, SHAPING THE MIXTURE INTO STREAMS COAGULATING AND REGENERATING THE MIXTURE FORMING THE STREAMS TO PROVIDE FILAMENTS COMPRISED OF NON-DERIVATIZED REGENERATED CELLULOSC HAVING UNIFORMLY DISPERSED THEREIN REGENERATED CYNOETHYL CELLULOSE AND POLYVINYLPYRROLIDONE, WITH THE NONDERIVATIZED REGENERATED CELLULOSE BEING THE MAJOR PORTION THEREOF, AND THEREAFTER CONVERTING THE FILAMENTS AND DRIED FIBERS.
Claim 2
Independent Claim
83 words
A METHOD FOR MAKING FLUID ABSORBENT ALLOY FIBERS COMPRISING MIXING A CYANOETHYLATED VISCOSE AND AN AQUEOUS SOLUTION OF POLYVINYLPYRROLIDONE WITH A NON-DERIVATIZED, FILAMENTFORMING VISCOSE, THE LATTER OF WHICH CONSTITUENTS THE MAJOR PORTION OF THE MIXTURE, SHAPING THE MIXTURE INTO STREAMS COAGULATING AND REGENERATING THE MIXTURE FORMING THE STREAMS TO PROVIDE FILAMENTS COMPRISED OF NON-DERIVATIZED REGENERATED CELLULOSC HAVING UNIFORMLY DISPERSED THEREIN REGENERATED CYNOETHYL CELLULOSE AND POLYVINYLPYRROLIDONE, WITH THE NONDERIVATIZED REGENERATED CELLULOSE BEING THE MAJOR PORTION THEREOF, AND THEREAFTER CONVERTING THE FILAMENTS AND DRIED FIBERS.
Claim 3
Dependent Claim
29 words
A method as defined in claim 1 wherein the polyvinylpyrrolidone has an average molecular weight of from about 100,000 to 400,000, and a K-value of from 50 to 100.
Claim 4
Dependent Claim
22 words
A method as defined in claim 1 wherein the cyanoethylated viscose has an average degree of substitution of from 0.25 to 0.65.
Claim 5
Dependent Claim
19 words
A method as defined in claim 1 wherein the cyanoethylated viscose and polyvinylpyrrolidone are present in generally equal amounts.
Claim 6
Dependent Claim
38 words
A method as defined in claim 1 wherein the cyanoethylated viscose and the polyvinylpyrrolidone are present in amounts ranging from 5 to 15% and 5 to 15%, respectively, based upon the weight of the cellulose in the viscose.
Claim 7
Dependent Claim
22 words
A method as defined in claim 2 wherein the cyanoethylated viscose has an average degree of substitution of from 0.25 to 0.65.
Claim 8
Dependent Claim
38 words
A method as defined in claim 6 wherein the cyanoethylated viscose and the polyvinylpyrrolidone are present in amounts ranging from 5 to 15% and 5 to 15%, respectively, based upon the weight of the cellulose in the viscose.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |