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:
Mar. 04, 2014
Filed:
Mar. 28, 2011
Yuichi Yamada, Aichi, JP;
Hiroaki Kuki, Aichi, JP;
Naomichi Miyashita, Aichi, JP;
Jiro Kyuno, Aichi, JP;
Yuichi Yamada, Aichi, JP;
Hiroaki Kuki, Aichi, JP;
Naomichi Miyashita, Aichi, JP;
Jiro Kyuno, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug having an insulator with improved breakage resistance. The spark plug has a cross-section that satisfies the following relationship: 0.6 mm<=L, where 'A' represents a connection point between a support portion of the insulator and an insulator trunk portion formed at a front end side with respect to the support portion, where 'B' represents a position closer to the outer circumference side among the positions of (a) an innermost position of a contact portion where the support portion and a packing are in contact with each other and (b) an intersection of the support portion and a virtual straight line that is parallel to an axial line of the spark plug and extends from an innermost circumferential end of a stepped portion of a metal shell, and where “L” represents a length of a path from point “A” to point “B” along a surface of the insulator.