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. 24, 2020
Filed:
May. 07, 2020
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Tatsuya Gozawa, Nagoya, JP;
Daiki Goto, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
A spark plug includes: a center electrode; a ground electrode that is provided such that a gap for spark discharge is formed between the center electrode and the ground electrode; and a plug cover covering the center electrode and the ground electrode to form an auxiliary chamber. The plug cover is provided with plural through holes. A relationship of 80<A/B<5000 is satisfied, where a sphere has a center at a midpoint of a line connecting the center electrode and the ground electrode at a shortest distance on an axial line and contacts a point located closest from the center on each of inner open ends of the through holes. A mmis a volume of a region of the auxiliary chamber, which is present in the sphere, and B mmis an average area of the inner open ends of the through holes.