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:
Apr. 07, 2015
Filed:
Apr. 03, 2009
Iwao Kunitomo, Aichi, JP;
Kenji Ban, Gifu, JP;
Iwao Kunitomo, Aichi, JP;
Kenji Ban, Gifu, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug in which a front end portion of a ground electrode is positioned outside of a virtual outer circumferential face that is formed by extending a front and outer circumferential face of a center electrode in the axis direction, and positioned on a front end side in the axis direction with respect to a virtual face including a front end face of the center electrode. Further, the equation 1.1≦b/a≦1.6 is satisfied, where 'a' (mm) represents a first minimal distance between the front end portion of the center electrode and the front end portion of the ground electrode and, where 'b' (mm) represents a second minimal distance between the front end portion of a ceramic insulator and the front end portion of the ground electrode.