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:
Apr. 02, 2013
Filed:
Sep. 09, 2009
Kazuyoshi Torii, Aichi, JP;
Tomoo Tanaka, Kitanagoya, JP;
Akira Suzuki, Nagoya, JP;
Mamoru Musasa, Nagoya, JP;
Naomichi Miyashita, Kasugai, JP;
Osamu Yoshimoto, Inazawa, JP;
Kazuyoshi Torii, Aichi, JP;
Tomoo Tanaka, Kitanagoya, JP;
Akira Suzuki, Nagoya, JP;
Mamoru Musasa, Nagoya, JP;
Naomichi Miyashita, Kasugai, JP;
Osamu Yoshimoto, Inazawa, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug having a center electrode and a ground electrode including a ground electrode main body part having an end thereof facing the center electrode and a noble metal tip joined to the ground electrode main body part at a position facing a leading end of the center electrode, a spark discharge gap being formed between the leading end of the center electrode and the noble metal tip, wherein at least a portion of the ground electrode main body part, to which the noble metal tip is joined, is made of an Ni alloy containing 12 to 45 mass % of Cr, 7 mass % or less of Fe, 0.5 to 5 mass % of Al, 0.3 to 5 mass % of Si and 50 mass % or more of the balance, and wherein the joined portion and the noble metal tip are joined by laser welding or electron beam welding.