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:
Jul. 26, 2016
Filed:
Dec. 11, 2015
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Mai Nakamura, Inazawa, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
A spark plug includes: a metal shell including a tool engagement portion and having a through hole; an insulator disposed in the through hole of the metal shell; and a metal terminal including: a trunk portion disposed in an axial hole of the insulator; a flange portion having a larger diameter than the trunk portion; and a head portion having a smaller diameter than the flange portion. A minimum thickness of an exposed portion of the insulator is equal to or less than 2.5 mm. A diameter difference between the maximum outer diameter of the head portion and the maximum outer diameter of the tool engagement portion is equal to or less than 9 mm, or a diameter difference between the maximum outer diameter of the exposed portion and the maximum outer diameter of the head portion is equal to or less than 2.3 mm.