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US3577873A
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Novel core yarns and methods for their manufacture
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-03-10
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Granted: 1971-05-11
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Expires: 1989-03-10
Abstract
Abstract Core yarns having a set false twisted core and reversing helical wrapping and processes for their manufacture involving feeding at least two continuous filamentary components having differing extensibility under a given stress to a false twisting machine.
Inventors
- 👤 G T Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:51
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/36; D02G1/00; D02G1/02; D02G1/0206; D02G1/024; D02G3/26; D02G3/28; D02G3/286
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
31 words
A core yarn according to claim 1 in which at least 95 percent by number of the intervals between helix reversals along the yarn are of length less than 2 cm.
Claim 2
Dependent Claim
31 words
A core yarn according to claim 1 in which at least 50 percent by number of the intervals between helix reversals along the yarn are of length less than 0.5 cm.
Claim 3
Dependent Claim
22 words
A core yarn according to claim 1 in which the wrapping component of reversing helices is intermittently wrapped around the core component.
Claim 4
Dependent Claim
16 words
A core yarn according to claim 1 which contains filaments differing in respect of chemical character.
Claim 5
Dependent Claim
20 words
A core yarn according to claim 1 in which at least some of the synthetic continuous filaments are conjugate filaments.
Claim 6
Dependent Claim
14 words
A core yarn according to claim 1 which has been stabilized to decay torque.
Claim 7
Dependent Claim
109 words
A process for making a core yarn having a core component of set false twisted filaments and at least one wrapping component of continuous filaments which are formed in helices the direction of which reverse at intervals along the yarn, said process comprising supplying at least two synthetic continuous filamentary components to in sequence a feed means, a heating zone and a false twisting element and withdrawing said filamentary components from said sequence under a higher tension than that under which the said components were supplied to said sequence the filamentary components differing as to their extensibility under the stresses on entering the yarn section of increasing twist gradient.
Claim 8
Dependent Claim
45 words
A process according to claim 8 in which the filamentary components supplied to the sequence are in an undrawn state and the filamenTary components are withdrawn from said sequence under a tension such that drawing has occurred in the yarn section of increasing twist gradient.
Claim 9
Dependent Claim
26 words
A process according to claim 8 in which the filamentary components differ as to their birefringence values on entering the yarn section of increasing twist gradient.
Claim 10
Dependent Claim
27 words
A process according to claim 8 in which the filamentary components differ as to their natural draw ratios on entering the yarn section of increasing twist gradient.
Claim 11
Dependent Claim
22 words
A process according to claim 8 in which the filamentary components enter the yarn section of increasing twist gradient at different speeds.
Claim 12
Dependent Claim
26 words
A process according to claim 8 in which the filamentary components are subjected to different heat treatments before entering the yarn section of increasing twist gradient.
Claim 13
Dependent Claim
25 words
A process according to claim 8 in which at least one of the filamentary components supplied to the sequence contains filaments in a drawn state.
Claim 14
Dependent Claim
26 words
A process according to claim 8 in which at least one of the filamentary components supplied to the sequence contains filaments in a partially drawn state.
Claim 15
Dependent Claim
24 words
A process according to claim 8 in which the filamentary components are withdrawn and subsequently heat treated while under a controlled tension and temperature.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |