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. 02, 2024
Filed:
Sep. 10, 2020
Ngk Spark Plug Co., Ltd, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
Spark plug has center electrode having leg portion extending in an axis direction, brim portion located at rear end side with respect to the leg portion and protruding outwards in a radial direction with respect to the leg portion and connecting portion connecting the leg portion and the brim portion; insulator having penetration hole and supporting the center electrode; and seal member filling the penetration hole and fixing the brim portion and the insulator. The center electrode satisfies '(D-D)/D≤0.06', where a maximum value of a radius of the brim portion is D, and a minimum value of the radius of the brim portion is D, also satisfies “L/L≤0.30”, where a size of the center electrode along the axis direction is L, and a size along the axis direction from boundary between the connecting portion and the leg portion to a center of gravity of the center electrode is L