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US4730179A Expired / Lapsed US ⏱️ 0.0 years remaining

Voltage non-linear resistor and its manufacture

Assignee: NGK Insulators Ltd
•
Filing: 1987-07-31
•
Granted: 1988-03-08
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Expires: 2007-07-31
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Abstract

Abstract A voltage non-linear resistor excellent in varistor voltage characteristics, lightning discharge current withstanding capability and life performance against applied voltage comprises a disc-like voltage non-linear element and a thin insulating covering layer integrally provided on the side surface of said element. In the resistor according to the invention, said element comprises zinc oxides as main ingredient, 0.1-2.0% bismuth oxides, as Bi 2 O 3 , 0.1-2.0% cobalt oxides, as CO 2 O 3 , 0.1-2.0% manganese oxides, as MnO 2 , 0.1-2.0% antimony oxides, as Sb 2 O 3 , 0.1-2.0% chromium oxides, as Cr 2 O 3 , 0.1-2.0% nickel oxides, as NiO, 0.001-0.05% aluminum oxides, as Al 2 O 3 , 0.005-0.1% boron oxides, as B 2 O 3 , 0.001-0.05% silver oxides, as Ag 2 O and 7-11% silicon oxides, as SiO 2 , and said layer comprises 45-60% silicon oxides, as SiO 2 , 30-50% zinc oxides, as ZnO, 1-5% bismuth oxides, as Bi 2 O 3 and antimony oxides for the remainder (% stands for mole %). The resistor of the invention preferably further comprises a thin glassy layer superimposed on the insulating covering layer. The resistors are advantageously adaptable to arrestors, surge absorbers used in high voltage power systems.

Inventors

  • 👤 Masami Nakata
  • 👤 Osamu Imai

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 10:55
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/12; H01C7/102; H01C17/00; H01C17/02; H01C7/105; H01C7/108; H01C7/112; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 188 words
A voltage non-linear resistor comprising a disc-like voltage non-linear resistance element and a thin insulating covering layer integrally provided on a peripheral side surface of said disc-like element, wherein said element comprises zinc oxides as a main ingredient, 0.1-2.0 mol. % bismuth oxides calculated as Bi 2 O 3 , 0.1-2.0 mol. % cobalt oxides calculated as Co 2 O 3 , 0.1-2.0 mol. % manganese oxides calculated as MnO 2 , 0.1-2.0 mol. % antimony oxides calculated as Sb 2 O 3 , 0.1-2.0 mol. % chromium oxides calculated as Cr 2 O 3 , 0.1-2.0 mol. % nickel oxides calculated as NiO, 0.001-0.05 mol. % aluminum oxides calculated as Al 2 O 3 , 0.005-0.1 mol. % boron oxides calculated as B 2 O 3 , 0.001-0.05 mol. % silver oxides calculated as Ag 2 O and 7-11 mol. % silicon oxides calculated as SiO 2 , and said layer comprises 45-60 mol. % silicon oxides calculated as SiO 2 , 30-50 mol. % zinc oxides calculated as ZnO, 1-5 mol. % bismuth oxides calculated as Bi 2 O 3 and antimony oxides for the remainder.
Claim 2
Dependent Claim 188 words
A voltage non-linear resistor comprising a disc-like voltage non-linear resistance element and a thin insulating covering layer integrally provided on a peripheral side surface of said disc-like element, wherein said element comprises zinc oxides as a main ingredient, 0.1-2.0 mol. % bismuth oxides calculated as Bi 2 O 3 , 0.1-2.0 mol. % cobalt oxides calculated as Co 2 O 3 , 0.1-2.0 mol. % manganese oxides calculated as MnO 2 , 0.1-2.0 mol. % antimony oxides calculated as Sb 2 O 3 , 0.1-2.0 mol. % chromium oxides calculated as Cr 2 O 3 , 0.1-2.0 mol. % nickel oxides calculated as NiO, 0.001-0.05 mol. % aluminum oxides calculated as Al 2 O 3 , 0.005-0.1 mol. % boron oxides calculated as B 2 O 3 , 0.001-0.05 mol. % silver oxides calculated as Ag 2 O and 7-11 mol. % silicon oxides calculated as SiO 2 , and said layer comprises 45-60 mol. % silicon oxides calculated as SiO 2 , 30-50 mol. % zinc oxides calculated as ZnO, 1-5 mol. % bismuth oxides calculated as Bi 2 O 3 and antimony oxides for the remainder.
Claim 3
Dependent Claim 134 words
A voltage non-linear resistor as claimed in claim 1, wherein said element comprises 0.5-1.2 mol. % bismuth oxides, as Bi 2 O 3 , 0.5-1.5 mol. % cobalt oxides, as Co 2 O 3 , 0.3-0.7 mol. % manganese oxides, as MnO 2 , 0.8-1.2 mol. % antimony oxides, as Sb 2 O 3 , 0.3-0.7 mol. % chromium oxides, as Cr 2 O 3 , 0.8-1.2 mol. % nickel oxides, as NiO, 0.002-0.005 mol. % aluminum oxides, as Al 2 O 3 , 0.01-0.08 mol. % boron oxides, as B 2 O 3 , 0.005-0.03 mol. % silver oxides, as Ag 2 O, and 8-10 mol. % silicon oxides, as SiO 2 , and said layer comprises 48-57 mol. % silicon oxides, as SiO 2 and 35-45 mol. % zinc oxides, as ZnO.
Claim 4
Dependent Claim 32 words
A voltage non-linear resistor as claimed in claim 1, wherein a boundary portion between said element and said layer comprises zinc silicate and a spinel Zn 7/3 Sb 2/3 O 4 .
Claim 5
Dependent Claim 18 words
A voltage non-linear resistor as claimed in claim 1, wherein said layer has a thickness of 30-100 μm.
Claim 6
Dependent Claim 22 words
A voltage non-linear resistor as claimed in claim 1, which further comprises a glassy layer superimposed on the thin insulating covering layer.
Claim 7
Dependent Claim 19 words
A voltage non-linear resistor as claimed in claim 5, wherein the glassy layer has a thickness of 50-100 μm.

References Cited (Backward Citations)

US4549981A Cited
US4386021A Cited
US4551268A Cited
US4516105A Cited
JPS5941286A Cited
JPS5941285A Cited
JPS604563A Cited
US4692735A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-03-08 1991-09-07 1992-03-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-03-08 1995-09-07 1996-03-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-03-08 1999-09-07 2000-03-08 $7700.00 Window Closed / Lapsed

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