Patent US4176211A successfully refreshed from Google Patents.
US4176211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
C-shaped polyester filaments
Assignee: BP Corp North America Inc
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Filing: 1978-05-02
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Granted: 1979-11-27
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Expires: 1998-05-02
Abstract
Abstract A method for producing polyester filament having a cross-section of C-shape by melt spinning polyester through a spinneret so that each filament is made through an array of holes having a center hole with eight holes equally spaced around the center hole with the size and spacing of the holes within a specified relationship. A method for producing partially oriented yarn having a cross-section of C-shape. A polyester filament produced, a yarn composed of a multiplicity of these filaments, and a fabric produced from the yarn.
Inventors
- 👤 Henry G. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A method for producing a polyester filament having a cross-section of C-shape, comprising extruding molten polyester through a spinneret having at least one array of circular holes in a pattern comprising a center hole with eight holes equally spaced around said center hole wherein each hole has an equal diameter of about 0.15 to about 0.75 mm and the radius at the center of each of the outside holes from the center of the central hole is up to about three times the diameter of the holes.
Claim 2
Independent Claim
87 words
A method for producing a polyester filament having a cross-section of C-shape, comprising extruding molten polyester through a spinneret having at least one array of circular holes in a pattern comprising a center hole with eight holes equally spaced around said center hole wherein each hole has an equal diameter of about 0.15 to about 0.75 mm and the radius at the center of each of the outside holes from the center of the central hole is up to about three times the diameter of the holes.
Claim 3
Dependent Claim
38 words
A method of claim 1 wherein each hole has a diameter of about 0.20 mm and the radius of the center of each of the outside holes from the center of the central hole is about 0.40 mm.
Claim 4
Dependent Claim
22 words
A method of claim 1 wherein said filament is discharged from the spinneret and air quenched at takeup conditions above 1800 meter/min.
Claim 5
Dependent Claim
15 words
A polyester filament having a cross-section of C-shape produced by the method of claim 1.
Claim 6
Dependent Claim
15 words
A polyester filament having a cross-section of C-shape produced by the method of claim 2.
Claim 7
Dependent Claim
11 words
A yarn comprised of a multiplicity of filaments of claim 4.
Claim 8
Dependent Claim
11 words
A yarn comprised of a multiplicity of filaments of claim 5.
Claim 9
Dependent Claim
9 words
A fabric knitted from the yarn of claim 6.
Claim 10
Dependent Claim
9 words
A fabric knitted of the yarn of claim 7.
Claim 11
Dependent Claim
9 words
A fabric woven of the yarn of claim 6.
Claim 12
Dependent Claim
9 words
A fabric woven of the yarn of claim 7.
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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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |