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:
Nov. 25, 2014
Filed:
Jun. 21, 2010
Tomoaki Kato, Nagoya, JP;
Tomoaki Kato, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug and manufacturing method. The spark plug () includes a metallic shell () extending along an axis CL, a ceramic insulator (), a center electrode (), and a ground electrode () having a base end portion joined to a front end face () of the metallic shell (). The method includes assembling the metallic shell () and a center electrode assembly (); and joining the ground electrode () to the front end face (). The distance between a reference plane SP perpendicular to the axis CLand the front end face () as measured along the axis CLvaries in the circumferential direction. In the joining step, the position of the distal end portion of the ground electrode () relative to the front end portion of the center electrode assembly () along the axis CLis adjusted by changing the region of the front end face () to which the ground electrode () is joined.