US4056652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monofilament of polyhexamethylene adipamide having a surface layer of reduced orientation relative to the orientation of the core
Assignee: EIDP Inc
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Filing: 1976-09-13
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Granted: 1977-11-01
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Expires: 1996-09-13
Abstract
Abstract Heavy denier, polyamide monofils are produced by the coupled steps of spinning, quenching, drawing and winding. Quenching involves passage of the filament through an air gap and a water bath. There are two stages of drawing. In the first stage, pressurized steam is used to deorient surface polymer and as a draw assist. The product is characterized by a surface layer of oriented polymer having reduced orientation relative to the orientation of the core polymer.
Inventors
- 👤 Sibbley Paul Gauntt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:09
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D01; D01D; D01D5/00; D01D5/253; D01F; D01F6/00; D01F6/58; D01F6/60; D02J1/222; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A filament of polyhexamethylene adipamide having a denier greater than 1000 and characterized by a polymer surface layer at least 3 and less than about 15 microns thick, said layer having an intermediate orientation relative to the orientation of the core and a refractive index, n∥, for the polymer in said surface layer of greater than 1.547 and less than 1.567 and the core polymer has a refractive index, n∥, of greater than 1.57.
Claim 2
Dependent Claim
74 words
A filament of polyhexamethylene adipamide having a denier greater than 1000 and characterized by a polymer surface layer at least 3 and less than about 15 microns thick, said layer having an intermediate orientation relative to the orientation of the core and a refractive index, n∥, for the polymer in said surface layer of greater than 1.547 and less than 1.567 and the core polymer has a refractive index, n∥, of greater than 1.57.
Claim 3
Dependent Claim
15 words
A filament of claim 1 having a denier of from about 3000 to about 5000.
Claim 4
Dependent Claim
12 words
A filament of claim 2 having a substantially flat, ribbon-shaped cross section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |