US3826696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rare earth intermetallic compounds containing calcium
Assignee: General Electric Co
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Filing: 1972-12-18
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Granted: 1974-07-30
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Expires: 1992-12-18
Abstract
Abstract A REDUCTION-DIFFUSION PROCESS FOR PRODUCING NOVEL RARE EARTH INTERMETALLIC COMPOUNDS, FOR EXAMPLE, COBALT-RARE EARTH INTERMETALLIC COMPOUNDS, ESPECIALLY COMPOUNDS USEFUL IN PREPARING PERMANET MAGNETS. A PARTICULATE MIXTURE OF RARE EARTH METAL OXIDE, COBALT AND CALCIUM HYDRIDE IS HEATED TO EFFECT REDUCTION OF THE RARE EARTH METAL OXIDE AND TO DIFFUSE THE RESULTING RARE EARTH METAL INTO THE COBALT TO FORM THE INTERMETALLIC COMPOUND.
Inventors
- 👤 R Cech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:45
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0553
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |