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:
Aug. 09, 2011
Filed:
Mar. 28, 2008
Mai Moribe, Inazawa, JP;
Akira Suzuki, Nagoya, JP;
Mai Moribe, Inazawa, JP;
Akira Suzuki, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A spark plug () for an internal combustion engine includes: a cylindrical insulator () having an axial hole () penetrating in a direction of an axis (C); a center electrode () partially inserted in the axial hole (); a metal shell () surrounding an outer periphery of the insulator () and which is fixed to the insulator () by means of a crimped portion () provided at a rear end portion of the metal shell (); and a ground electrode () joined to the metal shell () such that a portion of the ground electrode () opposes a leading end portion of the center electrode () via a spark discharge gap (), wherein the insulator () has an annular groove portion () which opposes an inner edge of the crimped portion ().