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US4284440A
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US
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Rare earth metal-cobalt permanent magnet alloy
Assignee: Proterial Ltd
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Filing: 1977-06-20
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Granted: 1981-08-18
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Expires: 1997-06-20
Abstract
Abstract A permanent magnet alloy made by adding one or more of Si, Ti, Zr, V, Nb, Cr, and Mo to a known permanent magnet alloy containing rare earth metals, Co, Fe, and Cu. By adding such additives, the amount of substitution of copper required for full precipitation hardening is reduced in the alloy of the present invention for the improvement in magnetic characteristics and thermal stability.
Inventors
- 👤 Masaaki Tokunaga
- 👤 Chitoshi Hagi
- 👤 Hirokazu Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:32
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A permanent magnet alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y M.sub.z).sub.A wherein R is one of the rare earth metal elements, M is at least Si or combination of Si with Ti and Mo, and 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
Claim 2
Dependent Claim
46 words
A permanent magnet alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y M.sub.z).sub.A wherein R is one of the rare earth metal elements, M is at least Si or combination of Si with Ti and Mo, and 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
Claim 3
Dependent Claim
19 words
A permanent magnet alloy as set forth in claim 1, wherein R is Sm and x=0.1, y=0.08, z=0.01, A=7.0.
Claim 4
Dependent Claim
19 words
A permanent magnet alloy as set forth in claim 1, wherein R is Sm and x=0.12, y=0.05, z=0.02, A=7.5.
Claim 5
Dependent Claim
12 words
A permanent magnet alloy as set forth in claim 1, wherein 7.5≦A≦8.3.
Claim 6
Dependent Claim
19 words
A permanent magnet alloy as set forth in claim 1, wherein R is Sm, Y or a combination thereof.
Claim 7
Dependent Claim
12 words
A permanent magnet alloy as set forth in claim 1, wherein 0.02≦y≦0.13.
Claim 8
Dependent Claim
16 words
A permanent magnetic alloy as set forth in claim 1, wherein R is Sm and 0.001≦z≦0.05.
Claim 9
Dependent Claim
34 words
A permanent magnetic alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y Si.sub.z).sub.A wherein R is at least one of the rare earth metal elements, 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
Claim 10
Dependent Claim
34 words
A permanent magnetic alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y Si.sub.z).sub.A wherein R is at least one of the rare earth metal elements, 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
Claim 11
Dependent Claim
12 words
A permanent magnetic alloy as set forth in claim 8, wherein 0.02≦y≦0.13.
Claim 12
Dependent Claim
26 words
A permanent magnetic alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y Si.sub.z).sub.A wherein R is Sm, 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
Claim 13
Dependent Claim
26 words
A permanent magnetic alloy consisting essentially of a composition expressed by a formula: R(Co.sub.1-x-y-z Fe.sub.x Cu.sub.y Si.sub.z).sub.A wherein R is Sm, 0.1≦x≦0.4, 0.02≦y≦0.25, 0.001≦z≦0.15 and 6.5≦A≦8.3.
References Cited (Backward Citations)
US3617260A
Cited
US3947295A
Cited
US3982971A
Cited
US3977917A
Cited
US4047982A
Cited
US4081297A
Cited
US4135953A
Cited
US4131495A
Cited
US4210471A
Cited
US4211585A
Cited
US4213803A
Cited
US4213802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |