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US3951889A
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Fluid absorbent alloy fibers
Assignee: Tambrands Inc
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Filing: 1974-12-06
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Granted: 1976-04-20
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Expires: 1994-12-06
Abstract
Abstract Alloy fibers having high fluid-holding capacity being comprised of a matrix of non-derivatized 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
2026-10-23 05:54
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/20; A61F13/2051; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01F6/00; D01F6/44; D01F6/56; A61F13/2002; A61F13/202; A61F2013/530131; A61F2013/530481; A61F2013/530489; A61F2013/530496
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
Fluid absorbent alloy fibers formed from non-derivatized viscose containing at least 5%, based upon the weight of the cellulose in such viscose, of each cyanoethylated viscose and polyvinylpyrrolidone, each of said fibers comprised of a matrix of non-derivatized regenerated cellulose having uniformly dispersed therein regenerated cyanoethyl cellulose having an average degree of cyanoethyl substitution of from about 0.25 to about 0.65 and polyvinylpyrrolidone having an average molecular weight of from about 100,000 to 400,000, the non-derivatized regenerated cellulose being the major portion of the respective fibers, said alloy fibers having fluid holding capacities greater than fibers formed of non-derivatized regenerated cellulose and alloy fibers comprised of a matrix of non-derivatized regenerated cellulose and either of said regenerated cyanoethyl cellulose and said polyvinylpyrrolidone.
Claim 2
Dependent Claim
122 words
Fluid absorbent alloy fibers formed from non-derivatized viscose containing at least 5%, based upon the weight of the cellulose in such viscose, of each cyanoethylated viscose and polyvinylpyrrolidone, each of said fibers comprised of a matrix of non-derivatized regenerated cellulose having uniformly dispersed therein regenerated cyanoethyl cellulose having an average degree of cyanoethyl substitution of from about 0.25 to about 0.65 and polyvinylpyrrolidone having an average molecular weight of from about 100,000 to 400,000, the non-derivatized regenerated cellulose being the major portion of the respective fibers, said alloy fibers having fluid holding capacities greater than fibers formed of non-derivatized regenerated cellulose and alloy fibers comprised of a matrix of non-derivatized regenerated cellulose and either of said regenerated cyanoethyl cellulose and said polyvinylpyrrolidone.
Claim 3
Dependent Claim
22 words
Fluid absorbent alloy fibers as defined in claim 1 wherein the regenerated cyanoethyl cellulose and polyvinylpyrrolidone are present in generally equal amounts.
Claim 4
Dependent Claim
31 words
Fluid absorbent alloy fibers as defined in claim 1 wherein the polyvinylpyrrolidone has an average molecular weight of from about 160,000 to 360,000 and a K-value of from 50 to 100.
Claim 5
Dependent Claim
22 words
Fluid absorbent alloy fibers as defined in claim 3 wherein the regenerated cyanoethyl cellulose and polyvinylpyrrolidone are present in generally equal amounts.
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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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |