Patent US3563899A successfully refreshed from Google Patents.
US3563899A
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Permanent magnet material having strontium ferrite base
Assignee: ZF International UK Ltd
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Filing: 1968-05-29
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Granted: 1971-02-16
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Expires: 1988-05-29
Abstract
Abstract UP TO 3% OF STRONIUM PHOSPHATE IS ADDED TO PERMANENT MAGNET MATERIAL OF KNOWN FROM HAVING A STRONTIUM FERRITE BASE. THE ADDITION OF THE STRONTIUM PHOSPHATE IS FOUND TO GIVE CONSIDERABLY IMPROVED MAGNETIC PROPERTIES.
Inventors
- 👤 Roger Frank Coe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683; C01; C01G; C01G49/00; C01G49/0018; C01G49/0036; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; C01P; C01P2006/00; C01P2006/42; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3213; C04B2235/3217; C04B2235/44; C04B2235/444; C04B2235/445; C04B2235/447; C04B2235/60; C04B2235/605
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |