Patent US4001252A successfully refreshed from Google Patents.
Patent US3961514A successfully refreshed from Google Patents.
US3961514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twist drawn wire, process and apparatus for making same
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1975-02-18
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Granted: 1976-06-08
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Expires: 1995-02-18
Abstract
Abstract This invention comprehends torsional strengthening of two-phase metal materials. One application of the torsionally strengthened material is in the field of springs wherein the energy storage capacity is increased. The invention provides for methods and processes for increasing the torsional strength of two-phase metal materials. Also comprehended is an apparatus that provides the increased torsional strength by its novel combination of machines.
Inventors
- 👤 Arthur L. Geary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:41
CPC Classifications
B; B21; B21F; B21F7/00; B21C; B21C1/00; B21C1/003; B21C3/00; B21C3/02; B21C3/12; C; C21; C21D; C21D8/00; C21D8/06; C21D9/00; C21D9/02; C22; C22F; C22F1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A method of increasing the torsional strength of metal wire by the steps of: a. cold drawing the wire to at least a 75% reduction in cross-sectional area; b. twisting the wire while in a plastically deforming state substantially within the reducing zone of the die; c. confining the wire twist in the reducing zone of the die by means of cooperating twist arresting rolls; and d. preventing over twist of the wire.
Claim 2
Independent Claim
73 words
A method of increasing the torsional strength of metal wire by the steps of: a. cold drawing the wire to at least a 75% reduction in cross-sectional area; b. twisting the wire while in a plastically deforming state substantially within the reducing zone of the die; c. confining the wire twist in the reducing zone of the die by means of cooperating twist arresting rolls; and d. preventing over twist of the wire.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the twisting is at least one T.P.I. of length.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the twist angle ranges from 1° to 45°.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the metal is type 18-8 stainless steel.
Claim 6
Independent Claim
108 words
A method of making an elongated metal bar having increased torsional strength properties in a preselected direction comprising the steps of: a. cold reducing the bar to a level wherein a portion of the microstructure exhibits elongated fibers; b. plastically deforming the elongated fibers by simultaneously twisting and reducing the bar substantially within the reducing portion of a die to increase the length of the elongated fibers and cause the elongated fibers to be in a helical orientation with relation to the longitudinal axis of the bar; and c. confining the wire twist within the reducing section of the reducing die by means of cooperating twist arresting rolls.
Claim 7
Independent Claim
108 words
A method of making an elongated metal bar having increased torsional strength properties in a preselected direction comprising the steps of: a. cold reducing the bar to a level wherein a portion of the microstructure exhibits elongated fibers; b. plastically deforming the elongated fibers by simultaneously twisting and reducing the bar substantially within the reducing portion of a die to increase the length of the elongated fibers and cause the elongated fibers to be in a helical orientation with relation to the longitudinal axis of the bar; and c. confining the wire twist within the reducing section of the reducing die by means of cooperating twist arresting rolls.
References Cited (Backward Citations)
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US2616478A
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US3158258A
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US3466916A
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US3677309A
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |