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. 13, 1999
Filed:
Jun. 27, 1997
Wataru Matsutani, Nagoya, JP;
Koji Okazaki, Nagoya, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A spark plug includes a central electrode, an insulator exterior to the central electrode, a metallic shell exterior to the insulator and having the central electrode protrude from one end of the metallic shell, a ground electrode having one end coupled to the metallic shell and having another end facing the central electrode, and an igniting portion secured to either the central electrode or to the ground electrode or to both for forming a spark discharge gap, wherein the igniting portion comprises a chip including a metal-oxide composite material including at least 10 wt % of Ir, an alloy having at least one element selected from a group consisting of Rh, Mo, Nb and Pt in a total amount in a range of 0.5 to 88.4 wt %, and a rare earth oxide in an amount ranging from 1.6 to 15 wt %.