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. 02, 2016
Filed:
May. 06, 2011
Norihide Kachikawa, Seto, JP;
Norihide Kachikawa, Seto, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A spark plug includes a center electrode, a ground electrode formed of a metal material containing 95% or more of nickel and a substantially cylindrical metal shell having a front end face to which one end of the ground electrode is welded. In the spark plug, the conditions: 0.15 mm≦BD≦0.40 mm; and (EW−EW)/EW≧0.1 are satisfied where BD is a depth from the front end face of the metal shell to a portion of the ground electrode embedded most deeply in the metal shell; EWis a width of a portion of the ground electrode located closest to a portion of the ground electrode deformed by the welding; and EWis a width of the portion of the ground electrode deformed by the welding at the front end face of the metal shell.