US3675408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide filaments
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1969-12-31
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Granted: 1972-07-11
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Expires: 1989-12-31
Abstract
Abstract A linear terpolyamide derived from 80 percent by weight of hexamethylene diammonium adipate, 10 percent by weight of caprolactam and 10 percent by weight of hexamethylene diammonium isophthalate is especially useful for melt spinning into a sideby-side conjugate filament in which the other component is preferably polyhexamethylene adipamide. In order to obtain a satisfactory crimp permanence and hot water retraction, the filament, after drawing, is heat relaxed at a relax ratio greater than 1.3. A monofilament yarn has particular application in the manufacture of stockings.
Inventors
- 👤 Burno Marcio Pacini
- 👤 Desmond Alfred Price
- 👤 Anil Chandrakant Parikh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/12; Y; Y10; Y10S; Y10S57/00; Y10S57/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2925; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A conjugate filament according to claim 1 wherein said homopolyamide is polyhexamethylene adipamide.
Claim 2
Dependent Claim
16 words
A conjugate filament according to claim 2 wherein said components exist in a highly eccentric relationship.
Claim 3
Dependent Claim
18 words
A conjugate filament according to claim 3 comprising equal proportions by weight of the terpolyamide and homopolyamide components.
Claim 4
Dependent Claim
29 words
A conjugate filament according to claim 4 being a monofilament having a retraction in water of at least 30 percent and a crimp permanence of at least 45 percent.
Claim 5
Dependent Claim
14 words
A multifilament yarn comprising two or more of the conjugate filaments of claim 1.
References Cited (Backward Citations)
US3322731A
Cited
US3526571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |