US4956114A
Expired / Lapsed
US
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Sintered ferrite body, chip inductor, and composite LC part
Assignee: TDK Corp
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Filing: 1988-06-29
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Granted: 1990-09-11
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Expires: 2008-06-29
Abstract
Abstract A ferrite composition comprising ferrite, borosilicate glass, and optionally boron oxide can be fired at a relatively low temperature of up to 950° C. into a sintered body having improved mechanical strength and electromagnetic properties. The sintered ferrite body is used to form a chip inductor. The inductor is combined with a capacitor to form a composite LC part.
Inventors
- 👤 Hideo Watanabe
- 👤 Yoichi Kanagawa
- 👤 Takashi Suzuki
- 👤 Takeshi Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:05
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A sintered ferrite body, consisting essentially of: a nickel based ferrite in combination with from about 15 to about 75% by weight of the body of a borosilicate glass, said borosilicate glass containing about 75 to about 90% by weight of silicon oxide, about 8 to about 20% by weight of boron oxide, 0 to about 5% by weight aluminum oxide, 0 to about 5% by weight of at least 1 oxide of a monovalent metal and 0 to about 5% by weight of at least 1 oxide of a divalent metal, said percentages based on the weight of borosilicate glass.
Claim 2
Dependent Claim
101 words
A sintered ferrite body, consisting essentially of: a nickel based ferrite in combination with from about 15 to about 75% by weight of the body of a borosilicate glass, said borosilicate glass containing about 75 to about 90% by weight of silicon oxide, about 8 to about 20% by weight of boron oxide, 0 to about 5% by weight aluminum oxide, 0 to about 5% by weight of at least 1 oxide of a monovalent metal and 0 to about 5% by weight of at least 1 oxide of a divalent metal, said percentages based on the weight of borosilicate glass.
Claim 3
Dependent Claim
25 words
The sintered ferrite body of claim 1, wherein said nickel based ferrite is a Ni-ferrite, a Ni-Cu ferrite, a Ni-Zn ferrite, or a Ni-Cu-Zn ferrite.
Claim 4
Dependent Claim
29 words
The sintered ferrite body of claim 1, wherein the nickel content of said ferrite ranges from about 45 to about 55 mol % of the ferrite calculated as NiO.
Claim 5
Dependent Claim
26 words
The sintered ferrite body of claim 3, wherein a portion of said nickel is replaced by up to 40 mol % of Cu, Zn or Li.
Claim 6
Dependent Claim
27 words
The sintered ferrite body of claim 1, wherein the content of the borosilicate glass in the ferrite-borosilicate glass combination ranges from about 25 to 35% by weight.
Claim 7
Dependent Claim
122 words
A sintered ferrite body, consisting essentially of: a combination of a nickel based ferrite, up to about 10% by weight of boron oxide, based on the weight of the body, and from about 15 to about 75% by weight, based on the weight of the body, of a borosilicate glass, said borosilicate glass containing about 75 to 90% by weight of silicon oxide, about 8 to about 20% by weight of boron oxide, 0 to about 5% by weight of aluminum oxide, 0 to about 5% by weight of at least one oxide of a monovalent metal and 0 to about 5% by weight of at least one oxide of a divalent metal, said percentages based on the weight of borosilicate glass.
Claim 8
Dependent Claim
122 words
A sintered ferrite body, consisting essentially of: a combination of a nickel based ferrite, up to about 10% by weight of boron oxide, based on the weight of the body, and from about 15 to about 75% by weight, based on the weight of the body, of a borosilicate glass, said borosilicate glass containing about 75 to 90% by weight of silicon oxide, about 8 to about 20% by weight of boron oxide, 0 to about 5% by weight of aluminum oxide, 0 to about 5% by weight of at least one oxide of a monovalent metal and 0 to about 5% by weight of at least one oxide of a divalent metal, said percentages based on the weight of borosilicate glass.
Claim 9
Dependent Claim
32 words
The sintered ferrite body of claim 6, wherein the boron oxide powder combined with nickel based ferrite and borosilicate glass has a particle size range of about 0.1 to about 10 μm.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |