US3932204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt-aluminum magnetic materials with high coercive force
Assignee: Research Institute for Electromagnetic Materials
•
Filing: 1971-09-07
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Granted: 1976-01-13
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Expires: 1991-09-07
Abstract
Abstract Magnetic materials having large coercive force consist essentially of 66 to 95% by weight of Co, 5 to 25% by weight of Al, and a small but effective amount of at least one of Ti, Mo, Cr, V and W, the amount of the third metal being effective to increase the coercive force substantially above the coercive force of the same Co-Al alloy without that third metal.
Inventors
- 👤 Hakaru Masumoto
- 👤 Kiyoshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3617260A
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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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |