US4160748A
Expired / Lapsed
US
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Non-linear resistor
Assignee: TDK Corp
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Filing: 1977-12-23
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Granted: 1979-07-10
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Expires: 1997-12-23
Abstract
Abstract A non-linear resistor comprises a sintered body of a ceramic composition which comprises 99.93 to 50 mole % of zinc oxide as ZnO; 0.01 to 10 mole % of a specific rare earth oxide as R 2 O 3 (R represents lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium or lutetium) 0.01 to 10 mole % of an alkaline earth oxide as MO (M represents calcium, strontium or barium) and 0.05 to 30 mole % of cobalt oxide as CoO.
Inventors
- 👤 Masatada Yodogawa
- 👤 Susumu Miyabayashi
- 👤 Yoshinari Yamashita
- 👤 Takashi Yamamoto
- 👤 Kohji Hayashi
- 👤 Hisayoshi Ueoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A non-linear resistor devoid of bismuth oxide and having a high value and high load life stability comprising a sintered body of a ceramic composition, which comprises: 99.93 to 50 mole % of zinc oxide as ZnO; 0.01 to 10 mole % of a specific rare earth oxide selected from the group consisting of oxides of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium as R 2 O 3 ; 0.01 to 10 mole % of an alkaline earth oxide selected from the group consisting of oxides of calcium, strontium and barium as MO; 0.05 to 30 mole % of cobalt oxide as CoO and 0.01 to 1 mole % of a specific tetravalent element oxide M'O 2 selected from the group consisting of oxides of silicon, germanium, tin, titanium, zirconium, hafnium and cerium.
Claim 2
Dependent Claim
140 words
A non-linear resistor devoid of bismuth oxide and having a high value and high load life stability comprising a sintered body of a ceramic composition, which comprises: 99.93 to 50 mole % of zinc oxide as ZnO; 0.01 to 10 mole % of a specific rare earth oxide selected from the group consisting of oxides of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium as R 2 O 3 ; 0.01 to 10 mole % of an alkaline earth oxide selected from the group consisting of oxides of calcium, strontium and barium as MO; 0.05 to 30 mole % of cobalt oxide as CoO and 0.01 to 1 mole % of a specific tetravalent element oxide M'O 2 selected from the group consisting of oxides of silicon, germanium, tin, titanium, zirconium, hafnium and cerium.
Claim 3
Dependent Claim
62 words
The non-linear resistor according to claim 1 wherein the ceramic composition comprises 99.74 to 69 mole % of the ZnO component, 0.05 to 5 mole % of the R 2 O 3 component, 0.1 to 5 mole % of the MO component, 0.1 to 20 mole % of the CoO component, and 0.01 to 1 mole % of the M'O 2 component.
Claim 4
Dependent Claim
62 words
The non-linear resistor according to claim 1 wherein the ceramic composition comprises 99.24 to 80.8 mole % of the ZnO component, 0.05 to 2 mole % of the R 2 O 3 component, 0.5 to 2 mole % of the MO component, 0.2 to 15 mole % of the CoO component and 0.01 to 0.2 mole % of the M'O 2 component.
Claim 5
Dependent Claim
141 words
A non-linear resistor devoid of bismuth oxide and having a high value and high load life stability comprising a sintered body of a ceramic composition, which comprises: 99.93 to 50 mole % of zinc oxide as ZnO; 0.01 to 10 mole % of a specific rare earth oxide R 2 O 3 selected from the group consisting of oxides of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; 0.01 to 10 mole % of an alkaline earth metal oxide MO selected from the group consisting of oxides of calcium, strontium and barium; 0.05 to 30 mole % of cobalt oxide as CoO and 0.01 to 1 mole % of a specific trivalent element oxide M" 2 O 3 selected from the group consisting of oxides of boron, aluminum, gallium, indium, yttrium, chromium, iron and antimony.
Claim 6
Dependent Claim
141 words
A non-linear resistor devoid of bismuth oxide and having a high value and high load life stability comprising a sintered body of a ceramic composition, which comprises: 99.93 to 50 mole % of zinc oxide as ZnO; 0.01 to 10 mole % of a specific rare earth oxide R 2 O 3 selected from the group consisting of oxides of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; 0.01 to 10 mole % of an alkaline earth metal oxide MO selected from the group consisting of oxides of calcium, strontium and barium; 0.05 to 30 mole % of cobalt oxide as CoO and 0.01 to 1 mole % of a specific trivalent element oxide M" 2 O 3 selected from the group consisting of oxides of boron, aluminum, gallium, indium, yttrium, chromium, iron and antimony.
Claim 7
Dependent Claim
63 words
The non-linear resistor according to claim 4 wherein the ceramic composition comprises 99.74 to 69 mole % of the ZnO component, 0.05 to 5 mole % of the R 2 O 3 component, 0.1 to 5 mole % of MO component, 0.1 to 20 mole % of the CoO component and 0.01 to 1 mole % of the M" 2 O 3 component.
Claim 8
Dependent Claim
64 words
The non-linear resistor according to claim 4 wherein the ceramic composition comprises 99.24 to 80.8 mole % of the ZnO component, 0.05 to 2 mole % of the R 2 O 3 component, 0.5 to 2 mole % of the MO component, 0.2 to 15 mole % of the CoO component and 0.01 to 0.2 mole % of the M" 2 O 3 component.
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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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |