US4489543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-crimping yarn
Assignee: Invista North America LLC
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Filing: 1981-12-10
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Granted: 1984-12-25
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Expires: 2001-12-10
Abstract
Abstract Polyester polymer is extruded through converging capillaries at different speeds to merge and form a combined stream. The stream is cooled to form a filament, which is withdrawn at a high speed. A plurality of such filaments are combined into yarn which self-crimps upon heating. In some embodiments, the yarn has a variable denier.
Inventors
- 👤 James E. Bromley
- 👤 John R. Dees
- 👤 Harold M. Familant
- 👤 Wayne T. Mowe
- 👤 Darwyn E. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:10
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/32; D01D5/22; D01F; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10S; Y10S57/00; Y10S57/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2925; Y10T428/2929; Y10T428/2931; Y10T428/2973; Y10T428/2976
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
An as-spun self-crimping yarn comprising a plurality of polyester continuous filaments, (a) said filaments having non-round cross-sectional areas which vary substantially regularly along the lengths of said filaments from regions of large cross-sectional area to regions of small cross-sectional area, said variation in cross-sectional area being more than ±10% about a mean value, (b) said regions of large and small cross-sectional area being out of phase from filament to filament to thereby form said self-crimping yarn.
Claim 2
Dependent Claim
76 words
An as-spun self-crimping yarn comprising a plurality of polyester continuous filaments, (a) said filaments having non-round cross-sectional areas which vary substantially regularly along the lengths of said filaments from regions of large cross-sectional area to regions of small cross-sectional area, said variation in cross-sectional area being more than ±10% about a mean value, (b) said regions of large and small cross-sectional area being out of phase from filament to filament to thereby form said self-crimping yarn.
Claim 3
Dependent Claim
20 words
The yarn defined in claim 1, wherein said variation in cross-sectional area is at least ±30% about said mean value.
Claim 4
Dependent Claim
57 words
The yarn defined in either of claims 1 or 2, wherein said regions of large cross-sectional area have substantially higher shrinkage than said regions of small cross-sectional area whereby said filaments have shrinkage profiles in the form of shrinkage peaks in said regions of large cross-sectional area and shrinkage valleys in said regions of small cross-sectional area.
Claim 5
Dependent Claim
47 words
The yarn defined in claim 3, wherein said shrinkage profiles are in the form of an average of at least two broad shrinkage peaks per 5 meters along the length of each of said filaments, said peaks and valleys being out of phase from filament to filament.
Claim 6
Dependent Claim
20 words
The yarn defined in claim 4, wherein at least one of said filaments has an average denier less than 5.
Claim 7
Dependent Claim
20 words
The yarn defined in claim 3 wherein each of said polyester continuous filaments has a shrinkage of less than 30%.
Claim 8
Dependent Claim
20 words
The yarn defined in claim 6 wherein each of said polyester continuous filaments has a shrinkage of less than 10%.
References Cited (Backward Citations)
US3852948A
Cited
US3387327A
Cited
US3497585A
Cited
US3700545A
Cited
US3744529A
Cited
JPS5158514A
Cited
US4059950A
Cited
US4026098A
Cited
DE2835706A1
Cited
GB2003423A
Cited
US4351147A
Cited
US4349604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |