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:
Feb. 05, 2013
Filed:
Dec. 27, 2011
Shinya Mitsuda, Inuyama, JP;
Takehito Kuno, Ichinomiya, JP;
Takaaki Kikai, Ama, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A spark plug provides a reduced production cost by forming a tip from a metallic material containing Ni that exhibits excellent erosion resistance. The spark plug comprises an insulator having an axial hole extending in an axial direction; a center electrode inserted into the axial hole at a front end thereof; a metallic shell provided around the insulator; a ground electrode whose proximal end portion is fixed to a front end portion of the metallic shell; and a tip bonded to a distal end portion of the ground electrode such that a spark discharge gap is formed between the tip and a front end portion of the center electrode. The tip is formed of a metallic material containing Ni in an amount of 93 mass % or more, and has a Vickers hardness of 163 Hv or less.