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:
May. 29, 2012
Filed:
Nov. 20, 2008
Hiroyuki Kameda, Aichi, JP;
Katsutoshi Nakayama, Nagoya, JP;
Satoshi Nagasawa, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A center electrode includes a tapered electrode base member mount and a noble metal tip joined to the electrode base member mount via a fused portion in which the component of the noble metal tip and the component of the electrode base member mount are fused. In this state, the cross section area Sat a tip side boundary between the fused portion and the noble metal tip and the cross section area Sat a base member side boundary between the fused portion and the electrode base member mount satisfy the relational expression of S<S. Regarding the cross section area Sat the base portion of the electrode base member mount, (S−S)/D satisfies the relational expression of 5≦(S−S)/D≦50. D is the shortest distance in the axis line direction from the base member side boundary to the base portion.