Patent US3598662A successfully refreshed from Google Patents.
US3598662A
Expired / Lapsed
US
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Method of manufacturing anisotropic permanent magnets
Assignee: US Philips Corp
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Filing: 1968-05-13
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Granted: 1971-08-10
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Expires: 1988-05-13
Abstract
Abstract A METHOD OF MANUFACTURING AN ANISOTROPIC PERMANENT MAGNET WHEREIN A FERROUS ALLOY CONSISTING OF 28 TO 45% OF CO, 10 TO 20% OF NI, 7 TO 9% OF AL, 7 TO 10% OF TI, UP TO 6% OF CU, AND THE REMAINDER PRINCIPALLY IRON IS QUENCHED ONLY FROM A TEMPERATURE BETWEEN 900* AND 1000* C. TO BELOW ITS CURIE POINT AND HELD AT A TEMPERATURE OF 10* TO 70*C. BELOW THE CURIE POINT IN A MAGNETIC FIELD.
Inventors
- 👤 Krijn Jacobus De Vos
- 👤 Pieter Aart Naastepad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:02
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/10; C22C38/105; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |