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:
Oct. 16, 2012
Filed:
Sep. 23, 2010
Kenichi Kumagai, Nagoya, JP;
Teruyuki Kondo, Kasugai, JP;
Kozo Amano, Nagoya, JP;
Kazuo Yamazaki, Osaka, JP;
Yoshihiro Nakai, Osaka, JP;
Masatada Numano, Osaka, JP;
Kenichi Kumagai, Nagoya, JP;
Teruyuki Kondo, Kasugai, JP;
Kozo Amano, Nagoya, JP;
Kazuo Yamazaki, Osaka, JP;
Yoshihiro Nakai, Osaka, JP;
Masatada Numano, Osaka, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A spark plug comprising: a cylindrical metal shell; a cylindrical insulator provided in an inner hole of said metal shell; a center electrode provided in a leading end side inner hole of said insulator; and a ground electrode having one end bonded to a leading end side of said metal shell and having another end face forming a spark discharge gap with said center electrode, wherein said ground electrode comprises an electrode material containing from 0.5 to 1.5 wt. % of Si, from 0.5 to 1.5 wt. % of Al, from 0.02 to 1.0 wt. % of at least one of Ti, V, Zr, Nb and Hf, from 0.03 to 0.09 wt. % of C and 95.5 wt. % or more of Ni, and having a specific resistance at 20° C. of 25 tincm or less.