US4174966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High coercive force rare earth metal-cobalt magnets containing copper and magnesium
Assignee: United States Department of the Interior
•
Filing: 1978-12-15
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Granted: 1979-11-20
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Expires: 1998-12-15
Abstract
Abstract A magnetic alloy composition, which comprises: an alloy of the formula: 34 to 37 wt.% RE 55.6 to 63.9 wt.% Co 2 to 7 wt.% Cu .05 to .40 wt.% Mg wherein RE is mischmetal or a rare earth metal excluding samarium.
Inventors
- 👤 John W. Walkiewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:06
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A magnetic alloy composition, which comprises: an alloy of the formula: 34 to 37 wt.% RE 55.6 to 63.9 wt.% Co 2 to 7 wt.% Cu 0.05 to 0.40 wt.% Mg wherein RE is mischmetal or a rare earth metal excluding samarium.
Claim 2
Dependent Claim
42 words
A magnetic alloy composition, which comprises: an alloy of the formula: 34 to 37 wt.% RE 55.6 to 63.9 wt.% Co 2 to 7 wt.% Cu 0.05 to 0.40 wt.% Mg wherein RE is mischmetal or a rare earth metal excluding samarium.
Claim 3
Dependent Claim
31 words
The alloy of claim 1, wherein said alloy is of the formula: 35 to 36 wt.% MM 4 to 7 wt.% Cu 0.05 to 0.30 wt.% Mg with the remainder cobalt.
Claim 4
Dependent Claim
29 words
The alloy of claim 2, wherein said alloy is of the formula: 35.5 wt.% MM 4.5 to 6.0 wt.% Cu 0.05 to 0.30 wt.% Mg with the remainder cobalt.
Claim 5
Dependent Claim
21 words
The alloy of claim 3, wherein said alloy is: 35.5 wt.% MM 5.0 wt.% Cu 0.18 wt.% Mg 59.32 wt.% Co.
Claim 6
Dependent Claim
21 words
The alloy of claim 3, wherein said alloy is: 35.5 wt.% MM 5.6 wt.% Cu 0.1 wt.% Mg 58.8 wt.% Co.
Claim 7
Dependent Claim
21 words
The alloy of claim 3, wherein said alloy is: 36.0 wt.% MM 5.0 wt.% Cu 0.18 wt.% Mg 58.82 Wt.% Co.
Claim 8
Dependent Claim
21 words
The alloy of claim 3, wherein said alloy is: 36.0 wt.% MM 6.0 wt.% Cu 0.21 wt.% Mg 57.79 wt.% Co.
Claim 9
Dependent Claim
15 words
The alloy of claim 1, wherein said rare earth element is praeseodymium, cerium or lanthanum.
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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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |