US4384022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filamentary structure
Assignee: Akzo Nobel UK PLC
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Filing: 1981-05-04
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Granted: 1983-05-17
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Expires: 2001-05-04
Abstract
Abstract A filamentary structure comprises a spiral thermoplastic core filament disposed within a thermoplastic sheath component, consisting either of a tube or of at least three thermoplastic filaments, the sheath component being joined to the successive turns of the spiral core filament. The spiral core filament and the sheath component may comprise the same or different thermoplastic polymers, suitable polymers being polyamides, polyesters and polyolefins. The core filament and the sheath component may be extruded together from a spinning jet, and a plurality of the filamentary structures may be extruded side-by-side so that their sheath components are joined together to form a fabric structure.
Inventors
- 👤 Anthony J. Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:27
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2929; Y10T428/2973; Y10T428/2975; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/61; Y10T442/637; Y10T442/641; Y10T442/643
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A filamentary structure produced directly by extrusion comprising a thermoplastic core filament extending in successive turns of a spiral about an axis, and thermoplastic sheath filaments, at least three in number, which extend linearly generally in the direction of said axis along the outside of the spiral and together form a cage thereabout, each of said sheath filaments being thermoplastically fused at spaced locations to the outside of each successive turn of said spiral core filament.
Claim 2
Dependent Claim
76 words
A filamentary structure produced directly by extrusion comprising a thermoplastic core filament extending in successive turns of a spiral about an axis, and thermoplastic sheath filaments, at least three in number, which extend linearly generally in the direction of said axis along the outside of the spiral and together form a cage thereabout, each of said sheath filaments being thermoplastically fused at spaced locations to the outside of each successive turn of said spiral core filament.
Claim 3
Dependent Claim
25 words
A filamentary structure as claimed in claim 1, in which each sheath filament is spaced apart from its adjacent sheath filaments by substantially equal distances.
Claim 4
Dependent Claim
28 words
A filamentary structure as claimed in claim 1 or 2, in which the sheath filaments are in substantially parallel alignment with the axis of the spiral core filament.
Claim 5
Dependent Claim
28 words
A filamentary structure as claimed in claim 1 or claim 2, in which each of the sheath filaments is of smaller cross-sectional area than the spiral core filament.
Claim 6
Dependent Claim
26 words
A filamentary structure as claimed in claim 1 or claim 2, in which the spiral core filament and/or the sheath filaments are of substantially circular cross-section.
Claim 7
Dependent Claim
26 words
A filamentary structure as claimed in claim 1, or claim 2, in which the spiral core filament and the sheath filaments comprise the same thermoplastic polymer.
Claim 8
Dependent Claim
25 words
A filamentary structure as claimed in claim 1, or claim 2, in which the spiral core filament and the sheath filaments comprise different thermoplastic polymers.
Claim 9
Dependent Claim
29 words
A filamentary structure as claimed in claim 1, or claim 2, in which the spiral core filament comprises a non-elastomeric polymer and the sheath filaments comprise an elastomeric polymer.
Claim 10
Dependent Claim
30 words
A filamentary structure as claimed in claim 1, or claim 2, in which the spiral core filament and/or the sheath filaments comprise a polyamide or a polyester or a polyolefin.
Claim 11
Dependent Claim
54 words
A filamentary structure comprising a thermoplastic core filament extending in successive turns of a spiral about an axis, and a tubular thermoplastic sheath extending co-axially with said spiral core filament along the outside of the spiral, the tubular sheath being thermoplastically fused to the outside of each successive turn of said spiral core filament.
Claim 12
Dependent Claim
54 words
A filamentary structure comprising a thermoplastic core filament extending in successive turns of a spiral about an axis, and a tubular thermoplastic sheath extending co-axially with said spiral core filament along the outside of the spiral, the tubular sheath being thermoplastically fused to the outside of each successive turn of said spiral core filament.
Claim 13
Dependent Claim
44 words
A fabric structure comprising a plurality of filamentary structures as claimed in claim 1, claim 2 or claim 10 extending in adjacent relation with the axes of the respective spiral core filaments substantially parallel, adjacent filamentary structures being thermoplastically fused together along their lengths.
Claim 14
Dependent Claim
18 words
A fabric structure as claimed in claim 11 in which the adjacent filamentary structures form a planar array.
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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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |