US4042429A
Expired / Lapsed
US
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Magnetic alloys having wasp-waisted magnetic hysteresis loop
Assignee: Panasonic Holdings Corp
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Filing: 1974-10-01
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Granted: 1977-08-16
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Expires: 1994-10-01
Abstract
Abstract Magnetic alloys consisting of 68.0 DIFFERENCE 73.0 weight % manganese, (1/10 Mn - 6.6) DIFFERENCE (1/3 Mn - 22.2) weight % carbon, the balance aluminum, which show wasp-waisted magnetic hysteresis loops with the ratio of the residual magnetization 4 pi Ir to the intensity of magnetization 4 pi I10000 in a magnetic field of 10000 Oe, Ir/I10000, falling 0.0 DIFFERENCE 0.2.
Inventors
- 👤 Shigeru Kojima
- 👤 Kiyoshi Kojima
- 👤 Tadao Ohtani
- 👤 Nobuyuki Kato
- 👤 Yoichi Sakamoto
- 👤 Isago Konno
- 👤 Masaharu Tsukahara
- 👤 Takao Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:51
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; C; C22; C22C; C22C22/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
A worked and heat-treated alloy product having a wasp-waisted magnetic hysteresis loop prepared by tempering an alloy composition consisting essentially of 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, said alloy having a hexagonal crystalline structure, at a temperature of from 530° to 750° C under an anisotropic stress of from 15 to 50 kg/mm 2 until the hexagonal crystalline structure of the alloy is transformed into a tetragonal crystalline structure; said alloy product thus-prepared, exhibiting a magnetic hysteresis loop in a wasp-waisted form such that the 4πI 10000 value is at least 5800 G wherein 4πI 10000 represents the intensity of magnetization in a magnetizing force of 10000 Oe and such that the value of the ratio Id/2Ir is more than 2 wherein Id represents the value of [4πI(R) -4πI(S)]/4π; 4πI(R) and 4πI(S) represent the intensity of magnetization at the intersecting points R and S of the wasp-waisted hysteresis loop and the perpendicular bisector of the line PQ, respectively as shown in the graph of the drawing; P and Q each represent points which give a half value of 4πI 10000 and Ir represents the residual magnetization divided by 4π.
Claim 2
Dependent Claim
207 words
A worked and heat-treated alloy product having a wasp-waisted magnetic hysteresis loop prepared by tempering an alloy composition consisting essentially of 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, said alloy having a hexagonal crystalline structure, at a temperature of from 530° to 750° C under an anisotropic stress of from 15 to 50 kg/mm 2 until the hexagonal crystalline structure of the alloy is transformed into a tetragonal crystalline structure; said alloy product thus-prepared, exhibiting a magnetic hysteresis loop in a wasp-waisted form such that the 4πI 10000 value is at least 5800 G wherein 4πI 10000 represents the intensity of magnetization in a magnetizing force of 10000 Oe and such that the value of the ratio Id/2Ir is more than 2 wherein Id represents the value of [4πI(R) -4πI(S)]/4π; 4πI(R) and 4πI(S) represent the intensity of magnetization at the intersecting points R and S of the wasp-waisted hysteresis loop and the perpendicular bisector of the line PQ, respectively as shown in the graph of the drawing; P and Q each represent points which give a half value of 4πI 10000 and Ir represents the residual magnetization divided by 4π.
Claim 3
Dependent Claim
46 words
A product of an alloy having a wasp-waisted magnetic hysteresis loop according to claim 1, wherein the alloy composition consists essentially of 70.0 to 72.2% by weight of manganese, (1/10 Mn - 6.6)% to (1/3 Mn - 22.2)% by weight of carbon and the remainder aluminum.
Claim 4
Dependent Claim
26 words
A product of an alloy having a wasp-waisted magnetic hysteresis loop according to claim 1, wherein the alloy contains lamellae of the compound Mn 3 AlC.
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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |