US3663317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a permanent-magnetisable body of compressed fine particles of a compound of m and r
Assignee: US Philips Corp
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Filing: 1970-11-18
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Granted: 1972-05-16
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Expires: 1990-11-18
Abstract
Abstract A method of manufacturing a permanent magnet from compressed M5R powder (M is, for example, Co, R is a rare earth or Th). The powder is obtained by grinding castings in oxygen- and water-free environments in an inert gas or an inert liquid. The resultant magnet exhibits a small ageing effect, while in addition magnets of higher density can be obtained.
Inventors
- 👤 Frans Frederik Westendorp
- 👤 Antonius Gregorius Rijnbeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:43
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; B; B22; B22F; B22F3/00; B22F3/02; B22F3/04; B22F9/00; B22F9/02; B22F9/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |