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:
Mar. 19, 2013
Filed:
Apr. 02, 2012
Ken Hanashi, Handa, JP;
Satoru Kadowaki, Mie-gun, JP;
Tsunenobu Hori, Kariya, JP;
Kenka Tsubota, Chiryu, JP;
Hirotaka Aida, Toyota, JP;
Hiroya Ishiguro, Kariya, JP;
Ken Hanashi, Handa, JP;
Satoru Kadowaki, Mie-gun, JP;
Tsunenobu Hori, Kariya, JP;
Kenka Tsubota, Chiryu, JP;
Hirotaka Aida, Toyota, JP;
Hiroya Ishiguro, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
A method of manufacturing a spark plug having an attachment fitting, an insulator, a center electrodeand an earth electrode. While fixed to attachment fitting, earth electrodehas a convex partformed by projecting a part of an opposed surfacetoward center electrode, and a concave partformed toward the opposed surfacefrom the earth electrode's back surface. The convex partis disposed so that the extension of a shaft center of the convex partpasses through the area in which the concave partis formed. The relation Ss is realized when an area of an opening of the concave partis set to Sand an average cross-section area of a cross section of the convex partperpendicular to an axial direction of the spark plug is set to s.