Patent US5504371A successfully refreshed from Google Patents.
US5504371A
Expired / Lapsed
US
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Semiconductor ceramic device having a ceramic element with negative temperature coefficient of resistance
Assignee: Murata Manufacturing Co Ltd
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Filing: 1994-07-15
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Granted: 1996-04-02
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Expires: 2014-07-15
Abstract
Abstract A ceramic element is formed by a rare earth and transition element oxide such as LaCoO 3 . The ceramic element is substantially isolated from the atmosphere by a case base, a case, etc.
Inventors
- 👤 Hideaki Niimi
- 👤 Kenjiro Mihara
- 👤 Yuichi Takaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:59
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C7/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A semiconductor ceramic device, comprising: a ceramic element having a resistance value at a specified temperature and a negative temperature coefficient of resistance, said ceramic element being formed of a rare earth and transition element oxide; and a cover for said ceramic element so that said ceramic element is substantially isolated from the atmosphere, said cover for said ceramic element isolating the ceramic element from the atmosphere and preventing a substantial change in the resistance value even when the ceramic element is heated to high operating temperatures by electrical current passing therethrough.
Claim 2
Dependent Claim
92 words
A semiconductor ceramic device, comprising: a ceramic element having a resistance value at a specified temperature and a negative temperature coefficient of resistance, said ceramic element being formed of a rare earth and transition element oxide; and a cover for said ceramic element so that said ceramic element is substantially isolated from the atmosphere, said cover for said ceramic element isolating the ceramic element from the atmosphere and preventing a substantial change in the resistance value even when the ceramic element is heated to high operating temperatures by electrical current passing therethrough.
Claim 3
Dependent Claim
21 words
A semiconductor ceramic device according to claim 1, wherein said rare earth and transition element oxide is made of LaCo oxide.
Claim 4
Dependent Claim
22 words
A semiconductor ceramic device according to claim 1, wherein said rare earth and transition element oxide is made of NdCoO 3 .
Claim 5
Dependent Claim
14 words
A semiconductor ceramic device according to claim 1, wherein said cover comprises a case.
Claim 6
Dependent Claim
17 words
A semiconductor ceramic device according to claim 4, wherein said case is made of heat resistant resin.
Claim 7
Dependent Claim
23 words
A semiconductor ceramic device according to claim 5, wherein said case is made of one of PPS resin, PET resin and PBT resin.
Claim 8
Dependent Claim
21 words
A semiconductor ceramic device according to claim 1, wherein said cover comprises a resin molding portion formed around said ceramic element.
Claim 9
Dependent Claim
19 words
A semiconductor ceramic device according to claim 7, wherein said resin molding portion is made of heat resistant resin.
Claim 10
Dependent Claim
23 words
A semiconductor ceramic device according to claim 8, wherein said resin molding portion is made of one of silicone resin and epoxy resin.
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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) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |