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:
Jan. 22, 2008
Filed:
Jun. 13, 2006
Hideki Teramura, Mie, JP;
Tomoaki Kato, Aichi, JP;
Kazuyoshi Torii, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A ground-electrode spark portionis formed from a noble metal which contains Pt as a main component, and is joined to a main metal portion of the ground electrodevia an alloy layer which has a thickness ranging from 0.5 μm to 100 μm and in which the noble metal that constitutes the ground-electrode spark portionand the metal that constitutes the main metal portion of the ground electrodeare alloyed with each other. The ground-electrode spark portionis configured such that a distal end surfacefacing a spark discharge gap g is smaller in diameter than a bottom surfacejoined to the ground electrode; and the distal end surfaceis protrusively located beyond the side surfaceof the ground electrode. When the ground-electrode spark portionis viewed in plane from the distal end surface, a portion of the surface of the ground-electrode spark portionis viewed as a peripheral exposed-region surfacewhich is exposed on the side surfaceof the ground electrodeso as to surround the distal end surface