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US5143638A
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Low power loss mn-zn ferrites
Assignee: JFE Steel Corp
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Filing: 1991-02-28
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Granted: 1992-09-01
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Expires: 2011-02-28
Abstract
Abstract A low power loss Mn-Zn ferrite consists essentially of Fe 2 O 3 , MnO and ZnO at a given mole ratio and contains given amounts of SiO 2 , CaO, niobium oxide and titanium oxide or antimony oxide as trace additives. This ferrite is suitable as a transformer material for switched mode power supply.
Inventors
- 👤 Masakatsu Yamazaki
- 👤 Tetsu Narutani
- 👤 Hideaki Kobiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2658
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A low power loss Mn-Zn ferrite consisting essentially of 52-54.5 mol % of Fe 2 O 3 , 33-40 mol % of MnO and 6-14 mol % of ZnO and containing 0.005-0.040 wt % of SiO 2 , 0.02-0.20 wt % of CaO, 0.01-0.08 wt % of Nb 2 O 5 and 0.005-0.08 wt % of Sb 2 O 3 .
Claim 2
Dependent Claim
61 words
A low power loss Mn-Zn ferrite consisting essentially of 52-54.5 mol % of Fe 2 O 3 , 33-40 mol % of MnO and 6-14 mol % of ZnO and containing 0.005-0.040 wt % of SiO 2 , 0.02-0.20 wt % of CaO, 0.01-0.08 wt % of Nb 2 O 5 and 0.005-0.08 wt % of Sb 2 O 3 .
References Cited (Backward Citations)
US3106534A
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GB1052455A
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JPS58114401A
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JPS6142104A
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JPS6199908A
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JPH01242494A
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |