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. 17, 2006
Filed:
Mar. 18, 2004
Applicants:
Hiroaki Nasu, Nagoya, JP;
Wataru Matsutani, Nagoya, JP;
Chiaki Kumada, Gifu, JP;
Katsunari Ninomiya, Tokai, JP;
Inventors:
Hiroaki Nasu, Nagoya, JP;
Wataru Matsutani, Nagoya, JP;
Chiaki Kumada, Gifu, JP;
Katsunari Ninomiya, Tokai, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T 13/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a glow plug and a spark plug, the surface of a main metal shell is coated with a chromate film in which the quantity of trivalent chrome is 95 wt % or more of the contained chrome components and which has a thickness of 0.2 μm to 0.5 μm.