US4133703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnetic Mn-Al-C alloy
Assignee: Panasonic Holdings Corp
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Filing: 1977-08-17
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Granted: 1979-01-09
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Expires: 1997-08-17
Abstract
Abstract A permanent magnetic alloy which is obtained by adding copper in amount of 0.5 to 6.2 wt% to the conventional Mn-Al-C alloy comprising 68.0 to 73.0 wt% of manganese, (1/10 Mn -- 6.6) to (1/3 Mn -- 22.2) wt% of carbon and the remainder aluminum and subjecting thus prepared alloy to warm plastic deformation in order to improve plasticity of the alloy.
Inventors
- 👤 Shigeru Kojima
- 👤 Kiyoshi Kojima
- 👤 Satoru Mitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:27
CPC Classifications
C; C22; C22C; C22C22/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
In a permanent magnet comprising an Mn-Al-C alloy containing 68.0 to 73.0 wt.% of manganese, (1/10 Mn -- 6.6) to (1/3 Mn -- 22.2) wt% of carbon and the remainder aluminum, said alloy having been subjected to warm plastic deformation, the improvement wherein said alloy contains copper in an amount of 0.5 to 6.2 wt.% in order to improve the plasticity of said alloy.
Claim 2
Dependent Claim
64 words
In a permanent magnet comprising an Mn-Al-C alloy containing 68.0 to 73.0 wt.% of manganese, (1/10 Mn -- 6.6) to (1/3 Mn -- 22.2) wt% of carbon and the remainder aluminum, said alloy having been subjected to warm plastic deformation, the improvement wherein said alloy contains copper in an amount of 0.5 to 6.2 wt.% in order to improve the plasticity of said alloy.
Claim 3
Dependent Claim
20 words
The permanent magnet according to claim 1 wherein copper is present in an amount between from 2.2 to 4.2 wt.%.
Claim 4
Dependent Claim
25 words
The permanent magnet according to claim 1 wherein the alloy further contains titanium in an amount of 0.01 to 0.5 wt% to further improve plasticity.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |