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:
Jun. 24, 2003
Filed:
Jan. 27, 1999
Toshitaka Honda, Aichi, JP;
Yutaka Tanaka, Kasugai, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
Disclosed is a spark plug with a built-in resistor comprises an insulator having an axially extending passing-through-hole , a terminal metal fitting fixed within the passing-through-hole at an end thereof, a center electrode fixed within the same passing-through-hole at the other end thereof and a resistor provided between the terminal metal fitting and the center electrode within the passing-through-hole . A surface layer region including the surface of the center electrode which is exposed to the resistor is a metallic layer formed of a metal based on at least one of Zn, Sn, Pb, Rh, Pd, Pt, Cu, Au, Sb and Ag or a Ni alloy containing at least one of B and P, so that the center electrode is provided in direct contact with the resistor on the surface of the metallic layer