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:
Oct. 25, 2011
Filed:
Dec. 17, 2008
Miyuki Yanagida, Tokyo, JP;
Koichi Yamaguchi, Tokyo, JP;
Katsuhiko Igarashi, Tokyo, JP;
Naoki Chida, Tokyo, JP;
Miyuki Yanagida, Tokyo, JP;
Koichi Yamaguchi, Tokyo, JP;
Katsuhiko Igarashi, Tokyo, JP;
Naoki Chida, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A varistorcomprises a varistor element, a pair of external electrodeson one main side of the varistor elementand a resistoron the same main side, wherein the resistoris formed so as to connect the pair of external electrodes. The varistor elementcontains zinc oxide as the main component and Ca oxides, Si oxides and rare earth metal oxides as accessory components, wherein the proportion X of the calcium oxides in terms of calcium atoms is 2-80 atomic percent with respect to 100 mol of the main component and the proportion Y of the silicon oxides in terms of silicon atoms is 1-40 atomic percent with respect to 100 mol of the main component, X/Y satisfying formula (1) below, and the external electrodes and resistor contain oxides other than bismuth oxide and copper oxide1≦<3  (1).