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:
Nov. 10, 2009
Filed:
Apr. 20, 2007
Hirohito Ito, Kounan, JP;
Takahiro Matsuura, Nagoya, JP;
Hirohito Ito, Kounan, JP;
Takahiro Matsuura, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug having a protrusion amount t of not smaller than 0.3 mm and satisfying a relation93° in which θis an included angle between virtual lines sand s, and θis an included angle between virtual lines sand swhen the virtual line sis taken as a line parallel to a direction of an axis and including the other end side edge on a leading end surface of a first precious metal tip, the virtual line sis taken as a line connecting the other end side edge and a point of intersection between an inner circumferential surface of a ground electrode body and the other end surface of the ground electrode body, the virtual line sis taken as a line parallel to the direction of the axis and including the other end side edge on a leading end surface of a center electrode, and the virtual line sis taken as a line including the other end side edge and tangent to an insulator.