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:
Jan. 06, 2015
Filed:
Jun. 09, 2014
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Kenji Ban, Gifu, JP;
Tatsunori Yamada, Seto, JP;
Tomokatsu Kashima, Kiyosu, JP;
Katsutoshi Nakayama, Shanghai, CN;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A ground electrode includes a main body portion and a projecting portion having a width smaller than a width of the main body portion. A spark discharge gap is formed between a discharging surface of the projecting portion and a front end surface of a center electrode. When the front end surface and the ground electrode are projected on a first plane, at least a part of the projection region of the projecting portion overlaps the projection region of the front end surface. A width Le (mm), a width Lc (mm), a cross-sectional area Sg (mm), a cross-sectional area Sc (mm), an angle θ1 (°), an angle θ2 (°), an angle θ3 (°), and an angle θ4 (°) satisfy expressions Le<Lc, 2.9≦Sc+Sg≦4.25, and 0.30≦(θ1/θ2)×(θ3/θ4)≦0.67.