US3625779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction-fusion process for the production of rare earth intermetallic compounds
Assignee: General Electric Co
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Filing: 1969-08-21
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Granted: 1971-12-07
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Expires: 1989-08-21
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)
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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) | 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 |