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:
Mar. 31, 2020
Filed:
Jul. 01, 2019
Applicant:
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Inventor:
Mai Nakamura, Nagoya, JP;
Assignee:
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T 13/38 (2006.01); H01T 13/08 (2006.01); H01T 13/06 (2006.01);
U.S. Cl.
CPC ...
H01T 13/38 (2013.01); H01T 13/06 (2013.01); H01T 13/08 (2013.01);
Abstract
The spark plug includes: an insulator having an axial hole formed along an axial line; and a metal terminal provided on a rear side of the axial hole of the insulator. The metal terminal has, at a rear end portion thereof, a bottom surface facing rearward and a projection projecting rearward from an outer edge of the bottom surface, and a mark is provided to at least a part of the bottom surface. The Vickers hardness of the projection is 100 HV or higher. A rear end surface of the projection is positioned on a rear side with respect to a rear end of the mark. An area of the rear end surface is 3 mmor greater.