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:
Jun. 04, 2019
Koa Corporation, Ina, JP;
Jfe Mineral Company, Ltd., Tokyo, JP;
Naomi Ishida, Fuchu, JP;
Yoji Gomi, Nagano, JP;
Kenichi Iguchi, Nagano, JP;
Etsurou Udagawa, Tokyo, JP;
Yuko Echizenya, Tokyo, JP;
Yoshimi Nakata, Tokyo, JP;
KOA Corporation, Nagano, JP;
JFE Mineral Company, Ltd., Tokyo, JP;
Abstract
Focusing on zinc oxide itself, which is a main raw material for a zinc oxide varistor (laminated varistor), a predetermined amount of additive is added to a zinc oxide powder having crystallite size of 20 to 100 nm, particle diameter of 20 to 110 nm found using a specific area BET method, untamped density of 0.60 g/cmor greater, and tap density of 0.80 g/cmor greater. This allows a zinc oxide sintered body to secure uniformity, high density, and high electric conductivity, resulting in a zinc oxide varistor with high surge resistance, capable of downsizing and cost reduction. Moreover, addition of aluminum (Al), as a donor element, to the zinc oxide powder allows control of sintered grain size in conformity with the aluminum added amount and baking temperature, and also allows adjustment of varistor voltage, etc.