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:
Mar. 08, 2005
Filed:
Mar. 27, 2002
Wataru Matsutani, Nagoya, JP;
Masayuki Segawa, Nagoya, JP;
Satoko Ito, Nagoya, JP;
Osamu Yoshimoto, Kakamigahara, JP;
Wataru Matsutani, Nagoya, JP;
Masayuki Segawa, Nagoya, JP;
Satoko Ito, Nagoya, JP;
Osamu Yoshimoto, Kakamigahara, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
The object of the present invention is to provide a spark plug having a discharge portion formed of a noble-metal chip increased in the Ir content while reducing the content of expensive Rh, which can be restrained from generation of unusual wear in the form of eroding the circumferential side surface of the noble-metal chip and exhibits excellent wear resistance. In the present invention, the discharge portion () in the center electrode () side is formed of a noble-metal chip () comprising an Ir-based alloy and the noble-metal chip () contains 90% by weight or more of Ir as the main component and further contains 0.5% by weight or more of Rh and from 0.5 to 8% by weight of Ni, whereby the noble-metal chip () [discharge portion ()] can be ensured with good wear resistance, the generation of unusual wear which readily occurs on decreasing the Rh content can be prevented by the addition of Ni and in turn, a spark plug having high performance can be fabricated at a low cost.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile