US3591428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic substance for the manufacture of a permanent magnet
Assignee: US Philips Corp
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Filing: 1968-11-26
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Granted: 1971-07-06
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Expires: 1988-11-26
Abstract
Abstract A PERNANENT MAGNET MATERIAL IS DISCLOSED HAVING A LARGE INTRINSIC COERCIVE FORCE (IHC) AND THUS STRONGLY RESISTANT TO DEMAGNETIZATION AND A LARGE ENERGY PRODUCT -(BH)MAX. THIS MATERIAL CONSISTS OF FINE PARTICLES HAVING PERMANENT MAGNET PROPERTIES AND CONSISTING ESSENTIALLY OF A COMPOUND M5R HAVING A HEXAGONAL CRYSTAL STRUCTURE. M IN THIS COMPOUND IS COBALT OR A COMBINATION OF COBALT WITH ONE OR MORE OF THE ELEMENTS FE, NI, AND CU WHILE R IS A RARE EARTH METAL (WHICH TERM INCLUDES Y) AND/OR TH. THESE PARTICLES ARE SURROUNDED WITH A METALLIC LAYER. D R A W I N G
Inventors
- 👤 Kurt Heinz Jurgen Buschow
- 👤 Pieter Aart Naastepad
- 👤 Wilhelmus Antonius Johan Velge
- 👤 Johannes Hendrikus Nicol Vucht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1803; C23C18/1824; C23C18/1827; C23C18/1834; C23C18/1601; C23C18/1633; C23C18/1635; C23C18/31; C23C18/32; C23C18/34; C23C18/36; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0551; H01F1/0552; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |