US4407889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Splittable hollow polyester filament
Assignee: EIDP Inc
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Filing: 1982-02-19
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Granted: 1983-10-04
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Expires: 2002-02-19
Abstract
Abstract Hollow filaments having longitudinal grooves and ridges that are readily split along the grooves and are especially adapted for use in a flocking process to form flocked products with a surface similar to suede. The hollow filaments have a denier of about 0.8 to about 3.35 and have a void area of 15 to 30% of the total area of the cross section of the fiber.
Inventors
- 👤 Daniel Gintis
- 👤 Elmer E. Most, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:43
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253; D01D5/24; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23993; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/2978
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A polyester filament having a denier in the range of about 0.8 to about 3.35, and a centrally located continuous longitudinally extending void, said void having an area of 15 to 30% of the total cross-sectional area of the filament, including the void, when measured on a cross section cut at a right angle to the longitudinal axis of the filament, the outer surface of said filament having the form of a plurality of ridges that extend longitudinally of the filament and a plurality of grooves that extend longitudinally along the filament, and having a groove ratio in the range of about 1.7 to about 2.3, said filament having a break elongation of less than about 30%.
Claim 2
Dependent Claim
117 words
A polyester filament having a denier in the range of about 0.8 to about 3.35, and a centrally located continuous longitudinally extending void, said void having an area of 15 to 30% of the total cross-sectional area of the filament, including the void, when measured on a cross section cut at a right angle to the longitudinal axis of the filament, the outer surface of said filament having the form of a plurality of ridges that extend longitudinally of the filament and a plurality of grooves that extend longitudinally along the filament, and having a groove ratio in the range of about 1.7 to about 2.3, said filament having a break elongation of less than about 30%.
Claim 3
Dependent Claim
13 words
The filament of claim 1 in which the polyester is a terephthalate polyester.
Claim 4
Dependent Claim
47 words
The filament of claim 2 in which the polyester is a terephthalate polyester selected from the class consisting of polyethylene terephthalate having a relative viscosity of 8 to 12, and copolyesters of ethylene terephthalate units and ethylene 5-(sodium-sulfo)isophthalate units having a relative viscosity of 7 to 13.
Claim 5
Dependent Claim
27 words
The filament of claim 1 in which the number of ridges on the outer surface of the fiber is at least 3 but not more than 8.
Claim 6
Dependent Claim
21 words
The filament of claim 3 in which the filament composition is a copolyester of ethylene terephthalate units and ethylene 5-(sodium-sulfo)isophthalate units.
Claim 7
Dependent Claim
20 words
The filament of claim 5 in which the number of ridges of the outer surface of the filament is 6.
Claim 8
Dependent Claim
37 words
The filament of claim 1 in which the centrally located continuous longitudinally extending void has, when viewed at a cross section cut at right angle to the length of the filament, the approximate shape of a circle.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |