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US3625779A Expired / Lapsed US ⏱️ 0.0 years remaining

Reduction-fusion process for the production of rare earth intermetallic compounds

Assignee: General Electric Co
•
Filing: 1969-08-21
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Granted: 1971-12-07
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Expires: 1989-08-21
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Abstract

Abstract A reduction-fusion process for producing novel rare earth intermetallic compounds, for example, cobalt rare earth intermetallic compounds, especially compounds useful in preparing permanent magnets. A particular mixture of rare earth metal oxide and calcium hydride is heated to affect reduction of the rare earth metal oxide. The resulting rare earth metal-containing mixture is fused with cobalt or other ferromagnetic metal to form the rare earth intermetallic compound and allowed to solidify. The solid is pulverized and then treated to recover the rare earth intermetallic compound.

Inventors

  • 👤 Robert E Cech

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 21:24
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0553; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 13 words
A process according to claim 1 wherein said metal group member is cobalt.
Claim 2
Dependent Claim 15 words
A process according to claim 1 wherein the rare earth metal oxide is samarium oxide.
Claim 3
Dependent Claim 18 words
A process according to claim 1 wherein calcium hydride is used in an amount in excess of stoichiometric.
Claim 4
Dependent Claim 17 words
A process according to claim 1 wherein said calcium hydride is formed in situ in said mixture.

References Cited (Backward Citations)

US2038402A Cited
US2043363A Cited
US2584411A Cited
US3104970A Cited
NL6608335A Cited
FR1488054A Cited
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US3424578A Cited
US3524800A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-12-06 1975-06-07 1975-12-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-12-06 1979-06-07 1979-12-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-12-06 1983-06-07 1983-12-07 $7700.00 Window Closed / Lapsed

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