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. 25, 2011
Filed:
Nov. 12, 2008
Mamoru Musasa, Nagoya, JP;
Naomichi Miyashita, Kasugai, JP;
Kazuyoshi Torii, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
There is provided a spark section () of needle-like shape protruding from an inner surface () of a ground electrode () to define a spark gap between the spark section and an electrode tip on a center electrode. The spark section () has a noble metal member () and an intermediate member () joined to each other. The materials of the noble metal member () and the intermediate member () are selected in such a manner that the thermal conductivity of the intermediate member () is lower than that of the noble metal member (). This limits heat radiation through the heat radiation passage from the noble metal member () through the intermediate member () to the ground electrode () so as to maintain the noble metal member () at a higher temperature than conventional types and reduce a quenching effect of the noble metal member () on a flame core generated in the spark gap for improvement in ignition performance.