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:
May. 14, 2019
Filed:
Jul. 08, 2016
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Kazuki Koike, Komaki, JP;
Takehito Kuno, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Abstract
A base end portion of a ground electrode of a spark plug includes a skin portion, an intermediate portion, and a core portion. A center cross section CP containing the center axis PX of the spark plug and the center axis EX of the base end portion includes a first multilayer portion in which the intermediate portion is disposed inward of the skin portion and the core portion is disposed inward of the intermediate portion, and a second multilayer portion in which the skin portion and the core portion are in direct contact with each other. The center cross section CP includes an intersection point PI at which a first boundary line BLa between the metallic shell and the skin portion and a second boundary line between the metallic shell and the core portion meet with a third boundary line BLc.