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:
Sep. 08, 2015
Filed:
Sep. 06, 2011
Applicants:
Kazuhiro Kodama, Hekinan, JP;
Hiroaki Nasu, Gifu, JP;
Inventors:
Kazuhiro Kodama, Hekinan, JP;
Hiroaki Nasu, Gifu, JP;
Assignee:
NGK SPARK PLUG CO., LTD., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T 13/00 (2006.01); H01T 13/06 (2006.01); H01T 13/20 (2006.01); H01T 13/39 (2006.01); H01T 13/32 (2006.01);
U.S. Cl.
CPC ...
H01T 13/06 (2013.01); H01T 13/20 (2013.01); H01T 13/32 (2013.01); H01T 13/39 (2013.01);
Abstract
To provide a technology of improving the corrosion resistance of a spark plug. A spark plug having a metal shell on the outer surface of which a nickel plated layer is formed as a protective surface film. The nickel plated layer is such that when the atomic concentrations of constituent elements are measured in a depth direction by an X-ray photoelectron spectroscopy (XPS), the concentration of carbon atoms is 1.0% to 10.0% at a depth at which the atomic concentration of Ni elements is 80%.