US4254181A
Expired / Lapsed
US
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Filaments having alternate S-twisted and Z-twisted helical sections produced by crimping filaments provided with an eccentric anisotropy of shrinkable property by a preferential cooling on one side upon extrusion thereof through a spinneret
Assignee: Solutia Inc
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Filing: 1978-03-20
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Granted: 1981-03-03
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Expires: 1998-03-20
Abstract
Abstract A textured melt-spun filament having alternate S-twisted and Z-twisted helical sections connected by twist reversal regions, the filament having a cross-section comprising a spiral wherein the outer portion of the spiral lies at the inside of the helical sections.
Inventors
- 👤 James E. Bromley
- 👤 Jing-Peir Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:20
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; D01D5/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2925
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
A filament having crimp comprising alternating S-twisted and Z-twisted helically coiled regions connected by twist reversal regions, said filament having a cross-section comprising a spiral wherein the outer portion of said spiral lies at the inside of the coils of said helically coiled regions and having a crimp of at least 8%.
Claim 2
Dependent Claim
52 words
A filament having crimp comprising alternating S-twisted and Z-twisted helically coiled regions connected by twist reversal regions, said filament having a cross-section comprising a spiral wherein the outer portion of said spiral lies at the inside of the coils of said helically coiled regions and having a crimp of at least 8%.
Claim 3
Dependent Claim
16 words
The filament defined in claim 1, wherein said spiral cross-section is closed at its inner end.
Claim 4
Dependent Claim
16 words
The filament defined in claim 1, wherein said spiral cross-section is open at its inner end.
Claim 5
Dependent Claim
18 words
The filament defined in claim 1, wherein said filament has a denier of between about 1.5 and 20.
Claim 6
Dependent Claim
13 words
The filament defined in claim 1, wherein said filament is formed from polyester.
Claim 7
Dependent Claim
15 words
The filament defined in claim 1, wherein said spiral extends over more than 360 degrees.
Claim 8
Dependent Claim
16 words
The filament defined in claim 1, wherein said filament has a crimp of at least 12%.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |