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. 22, 2017
Filed:
Dec. 08, 2014
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Kaori Suzuki, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Abstract
Disclosed is a spark plug with improved lifetime. The spark plug includes a first electrode and a second electrode having an electrode base and an electrode tip joined to the electrode base with a gap defined between the first electrode and the electrode tip. The electrode tip has a flat surface located apart from the electrode base and is joined to the electrode base at a side opposite to the flat surface by laser welding with emission of laser beam in a plane direction from one to the other end of the flat surface. A fused part is formed by the laser welding at the opposite side of the electrode tip. A cross-sectional shape of the fused part taken along a plane perpendicular to the flat surface and parallel to the plane direction has a constricted section at a position from one side to the other side in the plane direction.