US3565806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manganese zinc ferrite core with high initial permeability
Assignee: Siemens AG
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Filing: 1970-01-23
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Granted: 1971-02-23
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Expires: 1990-01-23
Abstract
Abstract A FERROMAGNETIC STRUCTURAL ELEMENT HAVING INITIAL PERMEABILITY HIGHER THAN 4000 IN THE OPERATING TEMPERATURE RANGE OF -50*C. TO +120*C. COMPOSED OF 54 TO 58 MOL PERCENT OF FE2O3 10 TO 24 MOL PERCENT OF MNO AND 18 TO 36 MOL PERCENT OF ZNO AND CONTAINING LESS THAN 0.05% BY WEIGHT OF IMPURITIES AND A METHOD OF MANUFACTURING THE SAME. THE METHOD INCLUDES MIXING THE ABOVE COMPONENTS AND SINTERING THEM AT 1270*C. TO 1300*C. FOR 4 TO 20 HOURS, WITH AT LEAST THE LAST HALF OF THE SINTERING TAKING PLACE IN AN INERT ATMOSPHERE HAVING LESS THAN 0.2% BY VOLUME OF OXYGEN AND COOLING THE SINTERED FERRITE TO ABOUT 300*C. IN THE SAME INERT ATMOSPHERE.
Inventors
- 👤 Erich Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2658
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |