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:
Sep. 05, 2017
Filed:
Sep. 14, 2016
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Jumpei Isasa, Nishikasugai-gun, JP;
Haruki Yoshida, Tajimi, JP;
Yutaka Yokoyama, Kasugai, JP;
Kuniharu Tanaka, Komaki, JP;
Nobuyoshi Araki, Nagoya, JP;
Toshiki Kon, Komaki, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
A spark plug includes an insulator made of an alumina sintered body containing AlOas a principal component and additional components including; an Si component, a Ba component, an Mg component, a Ca component, an Sr component, and a rare earth element component. When the additional components are expressed as oxides including R, R, R, R, R, and R, contents (mass %) of the sub-component satisfy expressions (1) to (6) as follows: (1) 1.0≦R≦5.0; (2) 0.5≦R≦5.0; (3) 0≦R≦0.18; (4) 0≦R/R≦0.36; (5) 0.3≦(R+R+R)≦1.8; and (6) 0≦R≦0.1.