US4282046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making permanent magnets and product
Assignee: General Electric Co
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Filing: 1979-07-16
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Granted: 1981-08-04
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Expires: 1999-07-16
Abstract
Abstract A hard magnetic article made by casting a magnetically soft amorphous metal ribbon and shaping it to the form and size of the desired permanent magnet article, and then heat treating the resulting soft magnetic body and thereby converting the metal of the ribbon to the hard magnetic state.
Inventors
- 👤 Peter G. Frischmann
- 👤 Fred E. Luborsky
- 👤 Russell E. Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:42
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0306
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
The method of making a magnetically hard article having a desired shape, volume and coercive force, which comprises the steps of casting a magnetic alloy composition in the form of a ductile, magnetically-soft amorphous metal ribbon, tightly winding the ductile ribbon to build up substantially the desired article shape and volume, preselecting a value of coercive force to be provided to said article, heating said wound ribbon to a preselected temperature above the crystallizatiion temperature for said magnetic alloy, and maintaining said wound ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically hard article results.
Claim 2
Independent Claim
109 words
The method of making a magnetically hard article having a desired shape, volume and coercive force, which comprises the steps of casting a magnetic alloy composition in the form of a ductile, magnetically-soft amorphous metal ribbon, tightly winding the ductile ribbon to build up substantially the desired article shape and volume, preselecting a value of coercive force to be provided to said article, heating said wound ribbon to a preselected temperature above the crystallizatiion temperature for said magnetic alloy, and maintaining said wound ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically hard article results.
Claim 3
Dependent Claim
31 words
The method of claim 1 in which the heating step is carried out so as to increase the grain size to maximize the coercive force of the resulting magnetically hard article.
Claim 4
Dependent Claim
47 words
The method of claim 1 in which the composition of the amorphous metal in (Fe x Ni y Co z ) 100-W G W , where G is silicon, phosphorus, boron, carbon, germanium, aluminum or mixture thereof, and where W is from 10 to 30 atomic percent.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein the composition is Fe 40 Ni 40 B 20 .
Claim 6
Dependent Claim
14 words
The method of claim 3 wherein the composition is Fe 80 B 20 .
Claim 7
Dependent Claim
14 words
The method of claim 3 wherein the composition is Fe 82 B 18 .
Claim 8
Independent Claim
102 words
The method of making a magnetically-hard article having a predetermined shape, volume and coercive force, which comprises the steps of casting a magnetic alloy composition in the form of ductile, magnetically-soft amorphous metal ribbon, forming a three-dimensional article with such ribbon arranged in overlapping relationship, preselecting a value of coercive force to be provided to said article, heating said overlapping ribbon to a preselected temperature above the crystallization temperature for said magnetic alloy, and maintaining said overlapping ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically-hard article results.
Claim 9
Independent Claim
102 words
The method of making a magnetically-hard article having a predetermined shape, volume and coercive force, which comprises the steps of casting a magnetic alloy composition in the form of ductile, magnetically-soft amorphous metal ribbon, forming a three-dimensional article with such ribbon arranged in overlapping relationship, preselecting a value of coercive force to be provided to said article, heating said overlapping ribbon to a preselected temperature above the crystallization temperature for said magnetic alloy, and maintaining said overlapping ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically-hard article results.
Claim 10
Dependent Claim
31 words
The method of claim 7 in which the heating step is carried out so as to increase the grain size to maximize the coercive force of the resulting magnetically hard article.
Claim 11
Dependent Claim
16 words
The magnetically hard article of wound or coiled ribbon made by the process 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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |