US4429524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
False-twist device
Assignee: IHO Holding GmbH and Co KG
•
Filing: 1982-03-23
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Granted: 1984-02-07
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Expires: 2002-03-23
Abstract
Abstract A false-twist device of the type in which a pair of crossing belts engage and twist the yarn between them utilizes magnetic means to press the belts together and apply a uniform force to the yarn.
Inventors
- 👤 Manfred Kress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/085
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
A method of imparting a false twist to a yarn, comprising the steps of: (a) passing said yarn between a pair of crossing driven belts; and (b) pressing said belts against said yarn and toward each other with magnetic force generated in the crossing region.
Claim 2
Independent Claim
45 words
A method of imparting a false twist to a yarn, comprising the steps of: (a) passing said yarn between a pair of crossing driven belts; and (b) pressing said belts against said yarn and toward each other with magnetic force generated in the crossing region.
Claim 3
Independent Claim
52 words
A device for imparting a false twist to a yarn, comprising: a pair of endless driven belts having crossing juxtaposed stretches with said yarn passing between said stretches at the crossing region; and magnetic means for pressing said stretches of said belts against said yarn and toward one another in said region.
Claim 4
Independent Claim
52 words
A device for imparting a false twist to a yarn, comprising: a pair of endless driven belts having crossing juxtaposed stretches with said yarn passing between said stretches at the crossing region; and magnetic means for pressing said stretches of said belts against said yarn and toward one another in said region.
Claim 5
Dependent Claim
31 words
The device defined in claim 2 wherein said magnetic means includes permanent magnet means in at least one of said belts applying an interactive force to the other of said belts.
Claim 6
Dependent Claim
15 words
The device defined in claim 3 wherein said other of said belts contains ferromagnetic material.
Claim 7
Dependent Claim
16 words
The device defined in claim 3 wherein the other of said belts contains permanent magnet material.
Claim 8
Dependent Claim
47 words
The device defined in claim 2 wherein said magnetic means includes a permanent magnet generating a magnetic field in said region and means in at least one of said belts responsive to said field for applying a force in the direction of the other of said belts.
Claim 9
Dependent Claim
24 words
The device defined in claim 3 wherein said magnetic means includes magnetic powder disposed along the surface of at least one of said belts.
Claim 10
Dependent Claim
18 words
The device defined in claim 7 wherein said magnetic powder is vulcanized to said one of said belts.
Claim 11
Dependent Claim
21 words
The device defined in claim 2 wherein said magnetic means includes a magnetic foil in at least one of said belts.
Claim 12
Dependent Claim
12 words
The device defined in claim 9 wherein said magnetic foil is perforated.
Claim 13
Dependent Claim
21 words
The device defined in claim 2 wherein at least one of said belts is provided with a braid of ferromagnetic wire.
References Cited (Backward Citations)
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US3813867A
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Cited
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US4248038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |