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:
Jul. 06, 1993
Filed:
Aug. 27, 1991
Osamu Imai, Kasugai, JP;
NGK Insulators, Ltd., , JP;
Abstract
An improved voltage non-linear resistor having a superior voltage-current characteristic property, a superior switching current impulse withstand capability, a superior lightning current impulse withstand capability, and a large discharge voltage V.sub.0.1mA of 230-330 V/mm, a small deterioration rate of the discharge voltage V.sub.0.1mA after applying a lightning current impulse, a prolonged electric life under electrical stress and an improved discharged voltage at a large current area is provided which contains zinc oxide as a main component, and desired amounts of subsidiary components of bismuth oxide, cobalt oxide, manganese oxide, antimony oxide, chromium oxide, silicon oxide, nickel oxide, aluminum oxide, boron oxide and silver oxide. The resistor has a discharge voltage of V.sub.0.1mA of 230-330 V/mm at a current density of 0.1 mA/cm.sup.2 calculated per unit thickness of the sintered resistor, a discharge voltage ration V.sub.10A /V.sub.0.1mA of 1.2-1.45 a current densities of 10 A/cm.sup.2 and 0.1 mA/cm.sup.2, a deterioration rate of discharge voltage of not more than 10% at a current density of 0.1 mA/cm.sup.2 before and after twice applying a lightning current impulse of a current density of 5 KA/cm.sup.2 (4/10 .mu.s wave form), and discharge voltage ratio V.sub.0.1mA /V.sub.1.mu.A of not more than 1.4 at current densities of 0.1 mA/cm.sup.2 and 1 .mu.A/cm.sup.2.