US4647895A
Expired / Lapsed
US
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Ceramic temperature sensor
Assignee: CTS Corp
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Filing: 1985-05-08
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Granted: 1987-03-03
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Expires: 2005-05-08
Abstract
Abstract A device for monitoring temperature as a function of electrical resistivity comprises a sensing element formed of a ceramic including lanthanum chromite with a dopant selected from magnesium oxide, aluminum oxide, titanium oxide and silicon oxide, and having electrodes operably affixed to the surface thereof.
Inventors
- 👤 Wei-Yean Howng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:54
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
45 words
A device suitable for monitoring temperature comprising a ceramic sensing element having opposed, generally planar surfaces and electrical leads operably associated with the opposed surfaces, said ceramic having a composition represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; 0<x≦0.2 0≦y≦0.2.
Claim 2
Independent Claim
45 words
A device suitable for monitoring temperature comprising a ceramic sensing element having opposed, generally planar surfaces and electrical leads operably associated with the opposed surfaces, said ceramic having a composition represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; 0<x≦0.2 0≦y≦0.2.
Claim 3
Dependent Claim
23 words
The device according to claim 1 wherein said ceramic includes a dopant selected from MgO, Al 2 O 3 and TiO 2 .
Claim 4
Dependent Claim
20 words
The device according to claim 2 wherein said ceramic further includes less than about 0.2 mole percent SiO 2 .
Claim 5
Dependent Claim
56 words
The device according to claim 1 wherein each opposed surface of the sensing element includes an electrode formed of a material selected from the group consisting of Ag, Au, Ag-Pd alloy, Ni-P alloy, Pt, RuO 2 , NiO, SnO 2 , In 2 O 3 , TiO 2 , ZnO, BaTiO 3 and BaPbO 3 .
Claim 6
Dependent Claim
32 words
The device according to claim 1 wherein each opposed surface of the sensing element includes an electrode formed of a material selected from the group consisting of Ag, Ag-Pd alloys and Pt.
Claim 7
Dependent Claim
22 words
The device according to claim 1 wherein the resistivity of said sensing element decreases on a logarithmic basis as the temperature increases.
Claim 8
Dependent Claim
22 words
The device according to claim 1 wherein the resistivity of said sensing element increases on a logarithmic basis as the temperature decreases.
Claim 9
Dependent Claim
23 words
The device according to claim 1 wherein the device is suitable for monitoring temperatures from ambient room temperature to about 800 degrees C.
Claim 10
Dependent Claim
18 words
A ceramic represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; and 0<x≦0.2 0≦y≦0.2.
Claim 11
Dependent Claim
18 words
A ceramic represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; and 0<x≦0.2 0≦y≦0.2.
Claim 12
Dependent Claim
50 words
A sensing element for monitoring temperature as a function of electrical resistivity comprising a ceramic having electrodes operably affixed thereon and being represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; and 0<x≦0.2 0≦y≦0.2 the resistivity of said sensing element changing as a function of temperature.
Claim 13
Dependent Claim
50 words
A sensing element for monitoring temperature as a function of electrical resistivity comprising a ceramic having electrodes operably affixed thereon and being represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; and 0<x≦0.2 0≦y≦0.2 the resistivity of said sensing element changing as a function of temperature.
Claim 14
Dependent Claim
50 words
The sensing element according to claim 10 wherein each electrode is formed of a material selected from the group consisting of Ag, Au, Ag-Pd alloy, Ni-P alloy, Pt, RuO 2 , NiO, SnO 2 , In 2 O 3 , TiO 2 , ZnO, BaTiO 3 and BaPbO 3 .
Claim 15
Dependent Claim
26 words
The sensing element according to claim 10 wherein each electrode is formed of a material selected from the group consisting of Ag, Ag-Pd alloy and Pt.
Claim 16
Dependent Claim
22 words
The sensing element according to claim 10 wherein the resistivity of said ceramic decreases on a logarithmic basis as the temperature increases.
Claim 17
Dependent Claim
22 words
The sensing element according to claim 10 wherein the sensitivity of said ceramic increases on a logarithmic basis as the temperature decreases.
Claim 18
Dependent Claim
25 words
The sensing element according to claim 10 wherein the sensing element is suitable for monitoring temperatures from ambient room temperature to about 800 degrees C.
Claim 19
Independent Claim
58 words
A device suitable for monitoring temperature comprising: (a) a ceramic sensing element having opposed, generally planar surfaces; (b) electrical leads operably associated with opposed surfaces of the sensing element; and (c) a dielectric material covering the sensing element, said ceramic having a composition represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; 0<x≦0.2 0≦y≦0.2.
Claim 20
Independent Claim
58 words
A device suitable for monitoring temperature comprising: (a) a ceramic sensing element having opposed, generally planar surfaces; (b) electrical leads operably associated with opposed surfaces of the sensing element; and (c) a dielectric material covering the sensing element, said ceramic having a composition represented by the formula: LaCr.sub.(1-x) Me.sub.x Si.sub.y O.sub.3 wherein Me=Mg, Al or Ti; 0<x≦0.2 0≦y≦0.2.
Claim 21
Dependent Claim
23 words
The device according to claim 16 wherein said ceramic includes a dopant selected from MgO, Al 2 O 3 and TiO 2 .
Claim 22
Dependent Claim
20 words
The device according to claim 17 wherein said ceramic further includes less than about 0.2 mole percent SiO 2 .
Claim 23
Dependent Claim
56 words
The device according to claim 16 wherein each opposed surface of the sensing element includes an electrode formed of a material selected from the group consisting of Ag, Au, Ag-Pd alloy, Ni-P alloy, Pt, RuO 2 , NiO, SnO 2 , In 2 O 3 , TiO 2 , ZnO, BaTiO 3 and BaPbO 3 .
Claim 24
Dependent Claim
32 words
The device according to claim 16 wherein each opposed surface of the sensing element includes an electrode formed of a material selected from the group consisting of Ag, Ag-Pd alloys and Pt.
Claim 25
Dependent Claim
22 words
The device according to claim 16 wherein the resistivity of said sensing element decreases on a logarithmic basis as the temperature increases.
Claim 26
Dependent Claim
22 words
The device according to claim 16 wherein the resistivity of said sensing element increases on a logarithmic basis as the temperature decreases.
Claim 27
Dependent Claim
23 words
The device according to claim 16 wherein the device is suitable for monitoring temperatures from ambient room temperatures to about 800 degrees C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |