Patent US3574116A successfully refreshed from Google Patents.
US3574116A
Expired / Lapsed
US
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Manganese-zinc ferrite with cobalt additive for producing a desired temperature coefficient of initial permeability
Assignee: NEC Corp
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Filing: 1968-07-23
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Granted: 1971-04-06
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Expires: 1988-07-23
Abstract
Abstract OXIDE MAGNETIC MATERIALS OF THE MANGANESE-ZINC FERRITE TYPE ARE GIVEN IMPROVED TEMPERATURE COEFFICIENTS OF INITIAL PERMEABILITY BY THE ADDITION OR SUBSTITUTION OF A COBALT COMPOUND SO THAT THE RESULTANT MATERIAL CONTAINS 0.01 TO 1.0 MOL PERCENT CO2O3. CALCIUM AND SILICON COMPOUNDS TO GIVE ULTIMATE MOL PERCENTS OF 0.1 TO 0.6 MOL PERCENT CAO AND 0.01 TO 0.07 MOL PERCENT SIO2 RESPECTIVELY MAY BE ADDED TO IMPROVE THE LOSS CHARACTERISTICS WITHOUT DELETERIOUS EFFECTS UPON THE AFORESAID TEMPERATURES COEFFICIENTS.
Inventors
- 👤 Izuru Sugano
- 👤 Taneaki Okuda
- 👤 Tsuneo Akashi
- 👤 Yoshihiro Kenmoku
- 👤 Toshiro Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |