US4786888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermistor and method of producing the same
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-09-25
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Granted: 1988-11-22
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Expires: 2007-09-25
Abstract
Abstract A negative temperature coefficient thermistor and a method of producing the same are disclosed. A thermistor element is placed between a pair of sheets of insulating ceramic and co-fired to be sintered into an independent thermistor unit. A pair of internal electrodes are provided on both sides of the thermistor unit and electrically connected to corresponding external electrodes.
Inventors
- 👤 Yasunobu Yoneda
- 👤 Michihiro Murata
- 👤 Harufumi Mandai
- 👤 Yukio Sakabe
- 👤 Yukio Banba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:07
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085; Y10T29/49101; Y10T29/49117; Y10T29/49204; Y10T29/49789
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
59 words
A negative temperature coefficient thermistor comprising: at least one thermistor element layer formed with a pair of internal electrodes; an insulating ceramic envelope for enclosing said thermistor element layer to be integrated therewith; a part of external electrodes provided on the exterior surface of said insulating ceramic envelope as being electrically connected to corresponding ones of said internal electrodes.
Claim 2
Dependent Claim
59 words
A negative temperature coefficient thermistor comprising: at least one thermistor element layer formed with a pair of internal electrodes; an insulating ceramic envelope for enclosing said thermistor element layer to be integrated therewith; a part of external electrodes provided on the exterior surface of said insulating ceramic envelope as being electrically connected to corresponding ones of said internal electrodes.
Claim 3
Dependent Claim
24 words
A thermistor as set forth in claim 1 wherein said insulating ceramic envelope comprises at least one of an oxide ceramic and nonoxide ceramic.
Claim 4
Dependent Claim
22 words
A thermistor as set forth in claim 1 wherein said internal electrodes are formed on both sides of said thermistor element layer.
Claim 5
Dependent Claim
19 words
A thermistor as claimed in claim 1, wherein said internal electrodes are formed inside of said thermistor element layer.
Claim 6
Dependent Claim
19 words
A thermistor as claimed in claim 1, wherein said internal electrodes comprise a metal material having high melting point.
Claim 7
Dependent Claim
13 words
A thermistor as claimed in claim 1, wherein said external electrodes comprise platinum.
Claim 8
Dependent Claim
73 words
A thermistor as claimed in claim 1, wherein said external electrodes are formed on the exterior surface of said insulating ceramic envelope having a parallel relation with said corresponding internal electrodes, the external electrodes being electrically connected to the corresponding internal electrodes by means of an electrically conductive material filled up in a pair of through holes formed in the insulating ceramic envelope between each corresponding ones of the external and internal electrodes.
Claim 9
Dependent Claim
30 words
A thermistor as claimed in claim 7, wherein said electrically conductive material filled up in said through holes is made of the same material as that of the external electrodes.
Claim 10
Dependent Claim
63 words
A thermistor as claimed in claim 1, wherein said pair of internal electroded are formed along the interior surface of the insulating ceramic envelope having such a relation that opposite ends of the internal electrodes extend in the opposite direction to be connected to corresponding ones of said external electrodes each being disposed apart in the directions in which the internal electrodes extend.
Claim 11
Dependent Claim
29 words
A thermistor as claimed in claim 1, which further comprises a diffusion preventing layer interposed between said thermistor element layer and the insulating ceramic envelope for preventing counter diffusion.
Claim 12
Dependent Claim
26 words
A thermistor as claimed in claim 10, wherein said diffusion preventing layer is provided on the outside of internal electrodes formed on the thermistor element layer.
Claim 13
Dependent Claim
65 words
A negative temperature coefficient thermistor comprising: at least one thermistor element layer formed with a pair of internal electrodes; an insulating ceramic envelope for enclosing said thermistor element layer to be integrated therewith; a pair of external electrodes provided on external surfaces of said insulating ceramic envelope; a pair of connecting members for electrically connecting said internal electrodes to corresponding ones of said external electrodes.
Claim 14
Dependent Claim
65 words
A negative temperature coefficient thermistor comprising: at least one thermistor element layer formed with a pair of internal electrodes; an insulating ceramic envelope for enclosing said thermistor element layer to be integrated therewith; a pair of external electrodes provided on external surfaces of said insulating ceramic envelope; a pair of connecting members for electrically connecting said internal electrodes to corresponding ones of said external electrodes.
Claim 15
Dependent Claim
39 words
A thermistor as claimed in claim 12, wherein said connecting members are made of an electrically conductive material filled up in a pair of through holes formed in said insulating ceramic envelope between said internal electrode and external electrode.
Claim 16
Dependent Claim
18 words
A thermistor as claimed in claim 12, wherein said connecting members are end portions of said internal electrodes.
Claim 17
Dependent Claim
21 words
A thermistor as claimed in claim 12, wherein said internal electrodes are formed on both sides of said thermistor element layer.
Claim 18
Dependent Claim
19 words
A thermistor as claimed in claim 12, wherein said internal electrodes are formed inside of said thermistor element layer.
Claim 19
Dependent Claim
52 words
A thermistor as claimed in claim 12, which further comprises respectively between said thermistor element layer and said insulating ceramic envelope, a pair of diffusion preventing layers for preventing diffusion of the ingredients contained in the thermistor element layer and the insulating ceramic envelope toward each other when they are fired together.
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |