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:
Jun. 28, 2022
Filed:
Dec. 07, 2017
Koa Corporation, Nagano, JP;
Jfe Mineral Company, Ltd., Tokyo, JP;
Yoji Gomi, Nagano, JP;
Kenichi Iguchi, Nagano, JP;
Etsurou Udagawa, Tokyo, JP;
Yuko Echizenya, Tokyo, JP;
Yoshimi Nakata, Tokyo, JP;
KOA Corporoation, Nagano, JP;
JFE Mineral Company, Ltd., Tokyo, JP;
Abstract
Focus is on zinc oxide itself, which is a base material for a zinc oxide varistor (laminated varistor), wherein specified quantities of additives are added to a zinc oxide powder having a crystallite size of 20 to 50 nm, grain diameter of 15 to 60 nm found using the specific surface area BET method, untamped density of 0.38 to 0.50 g/cm, and tap density of 0.50 to 1.00 g/cm. This allows securing of uniformity, high compactness, and high electrical conductivity of a zinc oxide sintered body, and provision of a zinc oxide varistor having high surge resistance.