US5210516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ptc thermistor and ptc thermistor producing method, and resistor with a ptc thermistor
Assignee: Murata Manufacturing Co Ltd
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Filing: 1991-02-22
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Granted: 1993-05-11
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Expires: 2011-02-22
Abstract
Abstract A PTC thermistor has its substrate entirely coated with an insulating glass material except for the area where a silver electrode is formed. Such a thermistor may be produced by coating a substrate with an insulating glass material, forming a silver layer on the coated substrate and fusing the silver layer with a part of the glass material so as to form an electrode adhering to the substrate. An underelectrode may be provided between the substrate and such an electrode. A resistor is formed by encasing such a PTC thermistor with a pair of spring terminals for supporting the thermistor therebetween.
Inventors
- 👤 Takashi Shikama
- 👤 Yuichi Takaoka
- 👤 Takayo Katsuki
- 👤 Tomoaki Tadokoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:44
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; H01C1/00; H01C1/02; H01C1/024; H01C1/034; H01C1/14; H01C1/1406; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
41 words
A PTC thermistor comprising: a substrate; an electrode having silver as its main constituent and being formed on the substrate; and an insulating glass coating covering the entire surface of the substrate except for the area where the electrode is formed.
Claim 2
Dependent Claim
41 words
A PTC thermistor comprising: a substrate; an electrode having silver as its main constituent and being formed on the substrate; and an insulating glass coating covering the entire surface of the substrate except for the area where the electrode is formed.
Claim 3
Dependent Claim
47 words
A PTC thermistor comprising: a substrate; an underelectrode formed on the substrate; an electrode having silver as its main constituent and being formed on the underelectrode; and an insulating glass coating covering the entire surface of the substrate except for the area where the electrode is formed.
Claim 4
Dependent Claim
47 words
A PTC thermistor comprising: a substrate; an underelectrode formed on the substrate; an electrode having silver as its main constituent and being formed on the underelectrode; and an insulating glass coating covering the entire surface of the substrate except for the area where the electrode is formed.
Claim 5
Independent Claim
101 words
A method for producing a PTC thermistor, said method comprising the steps of: coating a substrate with an insulating glass material to obtain a coated substrate; forming a silver layer on the coated substrate; and fusing the silver layer with a part of the insulating glass material therearound by heat so as to transform the silver layer into an electrode having silver as its main constituent, to cause the electrode to adhere to the substrate, and to have the rest of the insulating glass material cover the entire surface of the substrate except for the area where the electrode is formed.
Claim 6
Independent Claim
101 words
A method for producing a PTC thermistor, said method comprising the steps of: coating a substrate with an insulating glass material to obtain a coated substrate; forming a silver layer on the coated substrate; and fusing the silver layer with a part of the insulating glass material therearound by heat so as to transform the silver layer into an electrode having silver as its main constituent, to cause the electrode to adhere to the substrate, and to have the rest of the insulating glass material cover the entire surface of the substrate except for the area where the electrode is formed.
Claim 7
Independent Claim
109 words
A method of producing a PTC thermistor, said method comprising the steps of: coating a substrate with an insulating glass material to obtain a coated substrate, the substrate having an underelectrode on its surface; forming a silver layer on the coated substrate; and fusing the silver layer with a part of the insulating glass material therearound by heat so as to transform the silver layer into an electrode having silver as its main constitute, to cause the electrode to adhere to the underelectrode, and to have the rest of the insulating glass material cover the entire surface of the substrate except for the area where the electrode is formed.
Claim 8
Independent Claim
109 words
A method of producing a PTC thermistor, said method comprising the steps of: coating a substrate with an insulating glass material to obtain a coated substrate, the substrate having an underelectrode on its surface; forming a silver layer on the coated substrate; and fusing the silver layer with a part of the insulating glass material therearound by heat so as to transform the silver layer into an electrode having silver as its main constitute, to cause the electrode to adhere to the underelectrode, and to have the rest of the insulating glass material cover the entire surface of the substrate except for the area where the electrode is formed.
Claim 9
Dependent Claim
55 words
A resistor comprising: a PTC thermistor having an electrode formed on an area thereon and being coated with an insulating glass material except for the area where the electrode is formed; a case housing the PTC thermistor therein; and a pair of terminals disposed in the case so as to hold the PTC thermistor therebetween.
Claim 10
Dependent Claim
55 words
A resistor comprising: a PTC thermistor having an electrode formed on an area thereon and being coated with an insulating glass material except for the area where the electrode is formed; a case housing the PTC thermistor therein; and a pair of terminals disposed in the case so as to hold the PTC thermistor therebetween.
Claim 11
Dependent Claim
44 words
A resistor comprising: a PTC thermistor having an electrode formed on an area thereon and being coated with an insulating glass material except for the area where the electrode is formed; and a heat radiating member for radiating heat generated by the PTC thermistor.
Claim 12
Dependent Claim
44 words
A resistor comprising: a PTC thermistor having an electrode formed on an area thereon and being coated with an insulating glass material except for the area where the electrode is formed; and a heat radiating member for radiating heat generated by the PTC thermistor.
Claim 13
Dependent Claim
14 words
The PTC thermistor of claim 1 wherein the substrate is a rectangular ceramic member.
Claim 14
Dependent Claim
11 words
The PTC thermistor of claim 2 wherein the underelectrode comprises nickel.
Claim 15
Dependent Claim
14 words
The method of claim 3 wherein the silver layer is 2-6 μm in thickness.
Claim 16
Dependent Claim
15 words
The method of claim 9 wherein the step of fusing comprises sintering at 500° C.
Claim 17
Dependent Claim
10 words
The method of claim 4 wherein said underelectrode comprises nickel.
Claim 18
Dependent Claim
14 words
The method of claim 11 wherein the silver layer is 2-6 μm in thickness.
Claim 19
Dependent Claim
15 words
The method of claim 12 wherein the step of fusing comprises sintering at 500° C.
Claim 20
Dependent Claim
14 words
The resistor of claim 5 wherein the electrode has silver as its main constituent.
Claim 21
Dependent Claim
9 words
The resistor of claim 5 comprising two PTC thermistors.
Claim 22
Dependent Claim
21 words
The resistor of claim 5 wherein the terminals have elastic tabs and the PTC thermistor is elastically supported by the tabs.
Claim 23
Dependent Claim
14 words
The resistor of claim 6 wherein the electrode has silver as its main constituent.
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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) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |