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. 17, 2015
Filed:
Apr. 09, 2012
Naomichi Miyashita, Kasugai, JP;
Yuuichi Nakano, Nagoya, JP;
Naomichi Miyashita, Kasugai, JP;
Yuuichi Nakano, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A spark plug having a metallic shell extending along an axis (CL) and a solid annular gasket. The metallic shell has an externally threaded portion and a seat portion, and the gasket has an inside diameter smaller than the thread diameter of the externally threaded portion and is provided between the externally threaded portion and the seat portion. The forward end surface of the gasket has an inclined portion which inclines rearward with respect to the direction of the axis (CL) from the radially outer side toward the raidally inner side. The thickness of the gasket along the axis (CL) is 2.0 mm or less; the distance along the axis (CL) between the outermost circumferential edge and the innermost circumferential edge of inclined portion is 0.02 mm to 0.12 mm; and the Vickers hardness of the gasket is 60 Hv or more.