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:
Oct. 23, 2012
Filed:
Oct. 30, 2009
Applicants:
Haruki Yoshida, Aichi, JP;
Keita Nakagawa, Aichi, JP;
Tsutomu Shibata, Aichi, JP;
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T 13/20 (2006.01); F02M 57/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A spark plug () has a resistor () between a center electrodeand a metal terminal (). The resistor () contains glass, ceramic powder, an electrically conductive material, and metal. An average of two or more particles of the metal are present in an arbitrary region measuring 300 (μm)×300 (μm) on an arbitrary section of the resistor (), and the total sectional area of the metal present in the region accounts for less than 1.6% of the region.