US3978648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helically wrapped yarn
Assignee: Toray Industries Inc
•
Filing: 1974-04-09
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Granted: 1976-09-07
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Expires: 1994-04-09
Abstract
Abstract Helically wrapped yarn, having a bundle of substantially parallel core staple fibers, with uniformly helically wrapped staple fibers, and apparatus and method.
Inventors
- 👤 Seiichi Yamagata
- 👤 Kozo Susami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/38; D01; D01H; D01H1/00; D01H1/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A helically wrapped yarn which comprises a bundle of core fibers comprising substantially non-twisted staple fibers, and wrapped staple fibers disposed around said bundle of staple core fibers, said wrapped fibers being helically wrapped around the surface only of said core staple fibers, and being wrapped at a regular helical angle, and not extending into the bundle of core fibers, said wrapped fibers being positioned in an orderly arrangement and extending continuously along the length of the bundle of core fibers.
Claim 2
Dependent Claim
81 words
A helically wrapped yarn which comprises a bundle of core fibers comprising substantially non-twisted staple fibers, and wrapped staple fibers disposed around said bundle of staple core fibers, said wrapped fibers being helically wrapped around the surface only of said core staple fibers, and being wrapped at a regular helical angle, and not extending into the bundle of core fibers, said wrapped fibers being positioned in an orderly arrangement and extending continuously along the length of the bundle of core fibers.
Claim 3
Dependent Claim
34 words
A helically wrapped yarn according to claim 1, wherein said bundle of core fibers includes a plurality of non-wrapped portions which are expanded and protrude in the direction of the diameter of the yarn.
Claim 4
Dependent Claim
26 words
A helically wrapped yarn according to claim 1, wherein at least about 60% of said wrapped fibers are present as a bundle of 2-6 staple fibers.
Claim 5
Dependent Claim
38 words
A helically wrapped yarn according to claim 1, wherein the coefficient of variation ratio of intervals between wrapped positions of said wrapping fibers (CV %) = (standard deviation σ/average value) × 100 is not more than about 60%.
Claim 6
Dependent Claim
34 words
A helically wrapped yarn according to claim 1, wherein at least about 90% of said wrapped fibers are wrapped around said bundle of core fibers in a helical manner and in a constant direction.
Claim 7
Dependent Claim
25 words
A helically wrapped yarn according to claim 1 which has a coefficient of variation ratio of strength (CV %) of not more than about 20%.
Claim 8
Dependent Claim
17 words
A helically wrapped yarn according to claim 1 which has a twisting torque in a constant direction.
Claim 9
Dependent Claim
20 words
The helically wrapped yarn defined in claim 1 wherein the wrapped fibers are under greater tension than the core fibers.
References Cited (Backward Citations)
US3079746A
Cited
US3365872A
Cited
US3487619A
Cited
US3643416A
Cited
US3835637A
Cited
US3835639A
Cited
US3831369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |