US3684499A
Expired / Lapsed
US
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Method for producing intermetallic compound permanent magnet material
Assignee: BBC Brown Boveri AG Germany
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Filing: 1970-07-06
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Granted: 1972-08-15
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Expires: 1990-07-06
Abstract
Abstract AN INTERMETALLIC COMPOUND FOR FINE PARTICLE PERMANENT MAGNETS IS PRODUCED BY MIXING A RARE EARTH METAL HYDRIDE POWDER WITH A PURIFIED 3D-METAL POWDER IN A STOICHIOMETRIC RATIO UNDER A PROTECTIVE GAS ATMOSPHERE, THE MIXTURE IS THEN PRESSED TO FORM A TABLET, AND THE IS THEN SINTERED AT A TEMPERATURE OF FROM 750 TO 1250 DEG. C FOR A PERIOD OF FROM FOUR TO TEN HOURS UNDER EXCLUSION OF NITROGEN, OXYGEN AND CARBON. THE PREFERRED 3D-METAL IS COBALT SPONGE AND SUITABLE RARE EARTH METALS FROM WHICH THE METAL HYDRIDE IS FORMED INCLUDE SAMARIUM AND YTTRIUM.
Inventors
- 👤 Franz Hofer
- 👤 Claus Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:13
CPC Classifications
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 |