US3684591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered cobalt-rare earth intermetallic product including samarium and cerium and permanent magnets produced therefrom
Assignee: General Electric Co
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Filing: 1970-08-24
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Granted: 1972-08-15
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Expires: 1990-08-24
Abstract
Abstract NOVEL SINTERED COBALT-RARE EARTH INTERMATALLIC PRODUCTS ARE USED TO FORM PERMANENT MAGNETS HAVING UNIQUE PROPERTIES. THE SINTERED PRODUCT IS COMPRISED OF INTERMETALLIC COMPOUNDS OF COBALT AND RARE EARTH METLS COMPOSED OF SAMARIUM AND CERIUM. COBALT IS PRESENT IN AN AMOUNT OF ABOUT 60 TO 66 PERCENT BY WEIGHT OF THE PRODUCT AND THE RARE EARTH METALS ARE PRESENT IN AN AMOUNT OF ABOUT 34 TO 40 PERCENT BY WEIGHT OF THE PRODUCT WITH THE CERIUM COMPONENT RANGING IN AMOUNT FROM ABOUT 10 TO 90 PERCENT BY WEIGHT OF THE EARE EARTH CONTENT. PERMANENT MAGNETS ARE FORMED FROM THE SINTERED PRODUCT IN BULK FORM OR IN PARTICULATE FORM.
Inventors
- 👤 Donald L Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:32
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/086
Claims Analysis
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |