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. 02, 2024
Filed:
Nov. 16, 2020
Ngk Spark Plug Co., Ltd, Nagoya, JP;
Tatsuya Gozawa, Nagoya, JP;
NGK SPARK PLUG., LTD., Aichi, JP;
Abstract
A spark plug includes a metallic shell which holds a center electrode in an insulated condition, and a ground electrode is held in a penetration hole of the metallic shell. The penetration hole includes a circular counterbore portion, and a penetrating portion extending from the counterbore portion to an inner circumferential surface of the metallic shell. The ground electrode includes a fixing portion which is fixed to the counterbore portion, and an extension portion extending from the fixing portion. The extension portion has a flat surface which faces a forward end surface of the center electrode in the axial direction. The penetrating portion restricts the extension portion such that the flat surface of the extension portion faces toward a rear end side in the axial direction.