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. 11, 2007
Filed:
Feb. 13, 2002
Tetsuya Miwa, Nagoya, JP;
Tohru Yoshinaga, Okazaki, JP;
Keiji Kanao, Aichi-ken, JP;
Shinichi Okabe, Okazaki, JP;
Tetsuya Miwa, Nagoya, JP;
Tohru Yoshinaga, Okazaki, JP;
Keiji Kanao, Aichi-ken, JP;
Shinichi Okabe, Okazaki, JP;
DENSO Corporation, , JP;
Nippon Soken, Inc., , JP;
Abstract
A power-saving type of ignition apparatus is provided with a spark plug of which electrodes () are regulated in their shapes to lower an amount of energy required for its ignition. To face to a tip () of a center electrode () extending from a mounting bracket (), a cylindrical protrusion () is built on one surface () of an earth electrode (). The protrusion extends toward the center electrode to form a discharge gap () between the protrusion and the tip of the center electrode. Both of the tip of the center electrode and the protrusion of the earth electrode are 2.3 [mm] or less in each diameter (D, D), thus an amount of energy required for ignition being limited to 17 [mJ] or less.