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:
Jul. 05, 2016
Filed:
Aug. 23, 2013
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Hiroki Takeuchi, Aichi, JP;
Yutaka Yokoyama, Komaki, JP;
Kuniharu Tanaka, Komaki, JP;
Takeshi Mitsuoka, Kounan, JP;
Toshitaka Honda, Nagoya, JP;
Hirokazu Kurono, Nagoya, JP;
Katsuya Takaoka, Ichinomiya, JP;
Hironori Uegaki, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.