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. 13, 2009
Filed:
Oct. 29, 2007
Reimon Fukuzawa, Ama-gun, JP;
Jiro Kyuno, Kiyosu, JP;
Reimon Fukuzawa, Ama-gun, JP;
Jiro Kyuno, Kiyosu, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug for an internal combustion engine includes: a cylindrical insulator as defined herein; a center electrode as defined herein; a cylindrical metal shell as defined herein; and a ground electrode as defined herein, an annular gasket receiving portion projecting radially outward being provided on a rear end side of the externally threaded portion of the metal shell, and a metallic gasket capable of abutting against the gasket receiving portion being provided on the outer periphery of the metal shell, wherein the gasket has a solid annular shape, an inside diameter of the gasket is smaller than an outside diameter of the externally threaded portion, and a groove portion whose depth coincides with the direction of the axis is provided over an entire circumference of the gasket.