US3701695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a permanent magnet
Assignee: US Philips Corp
•
Filing: 1970-04-28
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Granted: 1972-10-31
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Expires: 1990-04-28
Abstract
Abstract METHOD OF MANUFACTURING A M5R MAGNET HAVING A VERY HIGH COERCIVE FORCCE (M IS A RARE EARTH METAL OR TH OR A COMBINATION THEREOF; R IS CO OR CO COMBINED WITH ONE OR MORE OF THE ELEMENTS FE, NI AND CU) BY SINTERING BETWEEN 800*C AND 1100* C. IN THE PRESENCE OF AN OXYGEN GETTER, EXAMPLES OF SUCH AN OXYGEN GETTER ARE Y, TH, CA, ZR, GD AND CE.
Inventors
- 👤 Kurt Heinz Jurgen Buschow
- 👤 Frans Frederik Westendorp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433; C22C1/0441; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0557
Claims Analysis
Total Claims: 0
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |