Patent US4521484A successfully refreshed from Google Patents.
US4521484A
Expired / Lapsed
US
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Self-crimping polyamide filaments
Assignee: EIDP Inc
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Filing: 1984-06-07
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Granted: 1985-06-04
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Expires: 2004-06-07
Abstract
Abstract A crimpable nylon bicomponent filament have a poly(hexamethylene adipamide) sheath and an eccentrically located core of a terpolymer of hexamethylene adipamide, hexamethylene isophthalamide and hexamethylene terephthalamide units in defined proportions.
Inventors
- 👤 George T. C. Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:23
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2925; Y10T428/2929; Y10T428/2931; Y10T428/2973
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A sheath-core bicomponent synthetic filament capable of forming a helical crimp upon relaxation consisting essentially of an oriented poly(hexamethylene adipamide) sheath comprising from 35% to 50% by weight of the filament and an eccentrically located ternary copolyamide core which consists essentially of at least about 60% by weight of hexamethylene adipamide units, from about 15% to 30% by weight of hexamethylene isophthalamide units and from about 5% to 10% by weight of hexamethylene terephthalamide units, the ratio of the weight percentages of the hexamethylene isophthalamide units to the hexamethylene terephthalamide units being from 1.5 to 6.0.
Claim 2
Dependent Claim
96 words
A sheath-core bicomponent synthetic filament capable of forming a helical crimp upon relaxation consisting essentially of an oriented poly(hexamethylene adipamide) sheath comprising from 35% to 50% by weight of the filament and an eccentrically located ternary copolyamide core which consists essentially of at least about 60% by weight of hexamethylene adipamide units, from about 15% to 30% by weight of hexamethylene isophthalamide units and from about 5% to 10% by weight of hexamethylene terephthalamide units, the ratio of the weight percentages of the hexamethylene isophthalamide units to the hexamethylene terephthalamide units being from 1.5 to 6.0.
Claim 3
Dependent Claim
20 words
A filament of claim 1 wherein the sheath comprises from about 40% to about 45% by weight of the filament.
Claim 4
Dependent Claim
34 words
A filament of claim 1 wherein the ratio of the weight percentage of hexamethylene isophthalamide units to that of the hexamethylene terephthalamide units is within the range of from about 1.5 to about 3.0.
Claim 5
Dependent Claim
26 words
A filament of claim 1 wherein the relative viscosity of the copolyamide is from about 13 to 14 units less than that of the poly(hexamethylene adipamide).
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |