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. 21, 2004
Filed:
Mar. 14, 2002
Applicant:
Inventors:
Tsunenobu Hori, Kariya, JP;
Yasutake Ishino, Kariya, JP;
Hironori Osamura, Chiryu, JP;
Akira Mitsuhashi, Okegawa, JP;
Mineo Okuma, Okegawa, JP;
Assignee:
Denso Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T 1/320 ;
U.S. Cl.
CPC ...
H01T 1/320 ;
Abstract
At least one of a center electrode and a ground electrode of an engine spark plug is a Ni-base alloy containing, in weight percentage, 0.5˜2.5% Si, 0.1˜1.2% Mn, 3.2˜5.0% Al, 0.9˜2.8% Cr, 0.001˜0.025% C in addition to Ni and unavoidable impurities. And, a value S/V is in a range from 1.7 mm to 3.9 mm when 'S' represents a surface area of the ground electrode and 'V' represents a volume of the ground electrode.