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. 07, 2019
Filed:
Oct. 11, 2016
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Tomoyuki Igarashi, Kasugai, JP;
NGK SPARK PLUG CO., LTD., Nagoya-shi, Aichi, JP;
Abstract
An electrode of the spark plug includes a first melt portion formed between a body portion of an intermediate member and a noble metal tip; and a second melt portion that is formed, between a flange portion of the intermediate member and an electrode base material, at least at a position of intersection with an axial line of the noble metal tip. In a cross section including the axial line of the noble metal tip, when: a diameter of the noble metal tip is denoted by Tw; the shortest distance between the second melt portion and a boundary between the first melt portion and the intermediate member is denoted by S; and the longest distance between the second melt portion and the boundary between the first melt portion and the intermediate member is denoted by S, 1.0 mm≤Tw≤1.2 mm and (S−S)≤0.3 mm are met.