Patent US6206888B1 successfully refreshed from Google Patents.
US4041689A
Expired / Lapsed
US
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Multilobal polyester yarn
Assignee: EIDP Inc
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Filing: 1975-11-11
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Granted: 1977-08-16
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Expires: 1995-11-11
Abstract
Abstract Draw-false-twist texturable polyester yarns are provided which have filaments having 6-10 essentially symmetric lobes of equal length equispaced around the central axis of the filament, a modification ratio of from 1.17 to 1.85 and a denier per filament between 3.8 R o and a maximum value which is a function of the modification ratio, the number of lobes and the factor R o which is a nominal draw ratio. Less than 12% of the draw-false-twist textured filaments have flattened cross-sectional peripheries greater than 10 microns in length.
Inventors
- 👤 Patrick Joseph Duncan
- 👤 Francis Edward Scrivener, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; D01F; D01F6/00; D01F6/58; D01F6/62; D02; D02G; D02G1/00; D02G1/02; D02G1/0286; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An improved partially oriented multifilament polyester yarn for draw-false-twist texturing composed of polyester filaments of multilobal cross-section characterized by a total number (N) of 6 to 10 essentially symmetric lobes of substantially equal length, equispaced radially about the center of the filament cross-section, a modification ratio (M) between 1.17 and 1.85 and a denier per filament of a minimum of 3.8R o and a maximum of (5.88M -10 + N) R o at M = 1.85, wherein R o is 1.25-5 and is equal to the ratio ##EQU2## in which E is the break elongation of the partially oriented yarn.
Claim 2
Dependent Claim
100 words
An improved partially oriented multifilament polyester yarn for draw-false-twist texturing composed of polyester filaments of multilobal cross-section characterized by a total number (N) of 6 to 10 essentially symmetric lobes of substantially equal length, equispaced radially about the center of the filament cross-section, a modification ratio (M) between 1.17 and 1.85 and a denier per filament of a minimum of 3.8R o and a maximum of (5.88M -10 + N) R o at M = 1.85, wherein R o is 1.25-5 and is equal to the ratio ##EQU2## in which E is the break elongation of the partially oriented yarn.
Claim 3
Dependent Claim
11 words
The yarn of claim 1 wherein the polyester is poly(ethylene terephthalate).
Claim 4
Dependent Claim
25 words
The yarn of claim 1 wherein the polyester is an ethylene terephthalate copolyester containing about 2 mole percent of 5-sodium-sulfo-isophthalate units in the polymer chain.
Claim 5
Dependent Claim
12 words
The yarn of claim 1 wherein the polyester filaments have octalobal cross-sections.
Claim 6
Dependent Claim
13 words
The yarn of claim 1 wherein the polyester filaments have positive lobe angles.
Claim 7
Dependent Claim
15 words
The yarn of claim 1 wherein the break elongation (E) is 62 - 575 percent.
Claim 8
Dependent Claim
17 words
The polyester yarn of claim 6 wherein the break elongation (E) is about 70 - 180 percent.
Claim 9
Dependent Claim
12 words
The yarn of claim 1 wherein R o is 1.2 - 2.
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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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |