The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1994
Filed:
Jan. 27, 1992
NGK Insulators, Ltd., , JP;
Abstract
A ZnO.sub.2 voltage non-linear resistor excellent in all characteristics of life under electrical stress, current impulse withstandability, discharge voltage ratio, change rate of discharge voltage after application of current impulse and moisture absorbency contains, as additive ingredients: 0.4-1.5 mol. % bismuth oxides as Bi.sub.2 O.sub.3, 0.3-1.5 mol. % cobalt oxides as Co.sub.2 O.sub.3, 0.2-1.0 mol. % manganese oxides as MnO.sub.2, 0.5-1.5 mol. % antimony oxides as Sb.sub.2 O.sub.3, 0.1-1.5 mol. % chromium oxides as Cr.sub.2 O.sub.3, 0.4-3.0 mol. % silicon oxides as SiO.sub.2, 0.5-2.5 mol. % nickel oxides as NiO, 0.001-0.05 mol. % aluminum oxides as Al.sub.2 O.sub.3, 0.0001-0.05 mol. % boron oxides as B.sub.2 O.sub.3, 0.0001-0.05 mol. % silver oxides as Ag.sub.2 O, and 0.0005-0.1 mol. % zirconium oxides as ZrO.sub.2, which bismuth oxides contain 30 wt. % of a .gamma.-type crystalline phase. A small-sizable ZnO.sub.2 voltage non-linear resistor having a higher varistor voltage in addition to the above characteristics contains, as additive ingredients: 0.3-1.5 mol. % bismuth oxides as Bi.sub.2 O.sub.3, 0.3-1.5 mol. % cobalt oxides as Co.sub.2 O.sub.3, 0.2-1.5 mol. % manganese oxides as MnO.sub.2, 0.5-1.5 mol. % antimony oxides as Sb.sub.2 O.sub.3, 0.1-1.5 mol. % chromium oxides as Cr.sub.2 O.sub.3, 4.0-10.0 mol. % silicon oxides as SiO.sub.2, 0.5-2.5 mol. % nickel oxides as NiO, 0.001-0.05 mol. % aluminum oxides as Al.sub.2 O.sub.3, 0.0001-0.05 mol. % boron oxides as B.sub.2 O.sub.3, 0.0001-0.05 mol. % silver oxides as Ag.sub.2 O, and 0.0005-0.1 mol % zirconium oxides as ZrO.sub.2, which bismuth oxides contain 30 wt. % of a crystalline .gamma.-type phase.