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. 23, 2012
Filed:
Dec. 25, 2008
Kazuyoshi Torii, Aichi, JP;
Akira Suzuki, Aichi, JP;
Naomichi Miyashita, Aichi, JP;
Mamoru Musasa, Aichi, JP;
Kenji Moritani, Aichi, JP;
Kazuyoshi Torii, Aichi, JP;
Akira Suzuki, Aichi, JP;
Naomichi Miyashita, Aichi, JP;
Mamoru Musasa, Aichi, JP;
Kenji Moritani, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark member () is formed by joining a noble metal member () and an intermediate member () and is provided in a spark discharge gap between a center electrode and a ground electrode (). A bottom surface () of the intermediate member () is resistance-welded to an inner surface () of the ground electrode (), and a weld metal zone () is formed in the region of joint therebetween. As viewed on the section of the spark member () which contains a centerline (Q), the weld metal zone () is reliably formed within the range of the length (D) of a columnar portion () as measured along a direction orthogonal to the projecting direction of the spark member () and has a length (d) of at least 0.1 times (10% of) the length (D).