US4521484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-crimping polyamide filaments
Assignee: EIDP Inc
•
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
2026-11-02 00:23
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).
References Cited (Backward Citations)
US3316589A
Cited
US3432476A
Cited
US3418199A
Cited
US3383369A
Cited
US3399108A
Cited
US3926924A
Cited
US3621089A
Cited
US4218509A
Cited
US3423923A
Cited
US3526571A
Cited
US3675408A
Cited
GB1346103A
Cited
US3901989A
Cited
US4069363A
Cited
US4238603A
Cited
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 |