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. 13, 2015
Filed:
May. 08, 2014
Ngk Spark Plug Co., Ltd., Nagoya, Aichi, JP;
Katsuya Takaoka, Aichi, JP;
Yutaka Yokoyama, Aichi, JP;
Kengo Fujimura, Aichi, JP;
Hironori Uegaki, Aichi, JP;
Hiroki Takeuchi, Aichi, JP;
Hirokazu Kurono, Nagoya, JP;
Toshitaka Honda, Aichi, JP;
Kuniharu Tanaka, Aichi, JP;
Takeshi Mitsuoka, Aichi, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met:0.40≦20.10≦0.40.