US3203838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing permanent magnets having large coercive force
Assignee: Research Institute for Electromagnetic Materials
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Filing: 1963-09-24
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Granted: 1965-08-31
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Expires: 1983-09-24
Abstract
No abstract record available.
Inventors
- 👤 Masumoto Hakaru
- 👤 Kobayashi Takeo
- 👤 Watanabe Kiyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:49
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; C; C22; C22C; C22C19/00; C22C19/007; C22C19/07; H01F1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF MANUFACTURING HIGH COERCIVE FORCE PERMANENT MAGNETS, COMPRISING HEATING AN ALLOY CONSISTING ESSENTIALLY OF ABOUT 20-92% COBALT, 7.9-26% ALUMINUM, AND AN EFFECTIVE AMOUNT UP TO ABOUT 65% NICKEL TO A TEMPERATURE ABOVE THE E+$ BINARY REGION, QUENCHING THE ALLOY TO A TEMPERATURE BELOW THE UPPER BOUNDARY OF THE E+$ BINARY REGION, HEATING THE ALLOY IN SAID BINARY REGION AT A TEMPERATURE SUFFICIENT TO PRECIPITATE FINE PARTICLES OF FERRO/ MAGNETIC $ IN A MATRIX OF NONMAGNETIC E, AND MAGNETIZING THE PRODUCT THUS OBTAINED IN A STRONG MAGNETIC FIELD TO OBTAIN A PERMANENT MAGNET HAVING HIGH COERCIVE FORCE.
Claim 2
Independent Claim
98 words
A METHOD OF MANUFACTURING HIGH COERCIVE FORCE PERMANENT MAGNETS, COMPRISING HEATING AN ALLOY CONSISTING ESSENTIALLY OF ABOUT 20-92% COBALT, 7.9-26% ALUMINUM, AND AN EFFECTIVE AMOUNT UP TO ABOUT 65% NICKEL TO A TEMPERATURE ABOVE THE E+$ BINARY REGION, QUENCHING THE ALLOY TO A TEMPERATURE BELOW THE UPPER BOUNDARY OF THE E+$ BINARY REGION, HEATING THE ALLOY IN SAID BINARY REGION AT A TEMPERATURE SUFFICIENT TO PRECIPITATE FINE PARTICLES OF FERRO/ MAGNETIC $ IN A MATRIX OF NONMAGNETIC E, AND MAGNETIZING THE PRODUCT THUS OBTAINED IN A STRONG MAGNETIC FIELD TO OBTAIN A PERMANENT MAGNET HAVING HIGH COERCIVE FORCE.
References Cited (Backward Citations)
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Cited
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Cited
US2118285A
Cited
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Cited
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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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |