Patent US3597357A successfully refreshed from Google Patents.
US3597357A
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US
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Method of making strontium-ferrite magnets and the products so produced
Assignee: Westinghouse Electric Corp
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Filing: 1968-03-19
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Granted: 1971-08-03
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Expires: 1988-03-19
Abstract
Abstract A PROCESS IS DESCRIBED FOR THE PRODUCTION OF STRONTIUM FERRITE MAGNETS EMPLOYING HEMATITE AND CELESTITE AS THE STARTING MATERIALS. DATA IS INCLUDED ON THE MAGNETIC CHARACTERISTICS AND THE HYSTERESIS PROPERTIES OF THE FINISHED MATERIAL.
Inventors
- 👤 Alexander W Cochardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:29
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C; C01; C01G; C01G49/00; C01G49/0018; C01G49/0036; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2683; C01P; C01P2004/00; C01P2004/60; C01P2004/61
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |