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:
May. 05, 2009
Filed:
Dec. 15, 2004
Hiroaki Kuki, Nagoya, JP;
Akira Suzuki, Aichi, JP;
Yoshihiro Matsubara, Mie, JP;
Kazuhiko Mori, Nagoya, JP;
Hiroaki Kuki, Nagoya, JP;
Akira Suzuki, Aichi, JP;
Yoshihiro Matsubara, Mie, JP;
Kazuhiko Mori, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
There is provided a spark plug wherein an insulator and a metallic shell, when observed in a section made by a plane including an axis of a spark plug, have therebetween a gap of less than 0.45 mm at a more front end side than an engagement position of a packing and a first insulator stepped portion, and the gap is provided axially from a most front end side engagement position of the packing and a first insulator stepped portion as a starting point to a finishing point that is apart from the starting point by 1.2 mm or more toward the front end side while being apart from a front end surface of the metallic shell by 7.9 mm or more toward a rear end side.