US3976519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machinable anisotropic permanent magnets of Mn-Al-C alloys
Assignee: Panasonic Holdings Corp
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Filing: 1974-07-23
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Granted: 1976-08-24
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Expires: 1994-07-23
Abstract
Abstract An anisotropic permanent magnet of an Mn-Al-C alloy containing 68.0% to 73.0% by weight of manganese, (1/10 Mn-6.6)% to (1/3 Mn-22.2)% by weight of carbon, and the remainder aluminum, which alloy is rendered anisotropic by deforming it plastically at a temperature of 530 DEG C to 830 DEG C.
Inventors
- 👤 Takao Kubo
- 👤 Tadao Ohtani
- 👤 Shigeru Kojima
- 👤 Nobuyuki Kato
- 👤 Kiyoshi Kojima
- 👤 Yoichi Sakamoto
- 👤 Isago Konno
- 👤 Masaharu Tsukahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:58
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; C; C22; C22C; C22C28/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
An anisotropic permanent magnet of an alloy which comprises 68.0 to 73.0 % by weight of manganese, carbon in an amount between the solubility limit and (1/3Mn--22.2)% and the remainder being aluminum, said alloy having been subjected to warm plastic deformation and wherein the anisotropic permanent magnet exhibits magnetic properties such that the (BH)max is above 4.8 × 10 6 G.Oe in its bulk state, and is further characterized in being machinable.
Claim 2
Dependent Claim
72 words
An anisotropic permanent magnet of an alloy which comprises 68.0 to 73.0 % by weight of manganese, carbon in an amount between the solubility limit and (1/3Mn--22.2)% and the remainder being aluminum, said alloy having been subjected to warm plastic deformation and wherein the anisotropic permanent magnet exhibits magnetic properties such that the (BH)max is above 4.8 × 10 6 G.Oe in its bulk state, and is further characterized in being machinable.
Claim 3
Dependent Claim
70 words
An anisotropic permanent magnet of an alloy which comprises 68.0 to 73.0 % by weight of manganese, carbon in amounts ranging from (1/10Mn--6.6)% to (1/3Mn--22.2)% and the remainder being aluminum, said alloy having been subjected to warm plastic deformation and wherein the anisotropic permanent magnet exhibits magnetic properties such that the (BH)max is above 4.8 × 10 6 G.Oe in its bulk state, and is further characterized in being machinable.
Claim 4
Dependent Claim
70 words
An anisotropic permanent magnet of an alloy which comprises 68.0 to 73.0 % by weight of manganese, carbon in amounts ranging from (1/10Mn--6.6)% to (1/3Mn--22.2)% and the remainder being aluminum, said alloy having been subjected to warm plastic deformation and wherein the anisotropic permanent magnet exhibits magnetic properties such that the (BH)max is above 4.8 × 10 6 G.Oe in its bulk state, and is further characterized in being machinable.
Claim 5
Dependent Claim
20 words
An anisotropic permanent magnet according to claim 2, wherein manganese is present in amounts between 68.0% to 70.5% by weight.
Claim 6
Dependent Claim
18 words
An anisotropic permanent magnet according to claim 2, wherein the alloy contains the compound Mn 3 AlC therein.
Claim 7
Dependent Claim
30 words
An anisotropic permanent magnet according to claim 2, wherein the alloy contains manganese in an amount of 70.5% to 72.5% and which also contains the compound Mn 3 AlC therein.
Claim 8
Dependent Claim
63 words
An anisotropic permanent magnet according to claim 2, wherein the alloy further contains at least one or more additive elements selected from the group of Nb, Mo, B, Ti, Fe, Ge, Ni and Co in an effective amount up to 6 wt. parts based on 100 parts of the manganese-aluminum-carbon alloy to increase the (BH)max value of the alloy defined in claim 2.
Claim 9
Dependent Claim
55 words
An anisotropic permanent magnet according to claim 2, wherein the alloy further contains one or two additive elements selected from the group consisting of Pb and Zn in an effective amount up to 6 wt. parts based on 100 parts of the manganese-aluminum-carbon alloy to increase the plasticity of the alloy defined in claim 27.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |