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:
Dec. 20, 2016
Filed:
Mar. 06, 2014
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Yuichi Matsunaga, Kounan, JP;
Yasushi Sakakura, Ichinomiya, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A spark plug () includes an insulator () having an axial hole (), a center electrode () inserted into the axial hole (), a metallic shell () provided around the insulator (), a ground electrode () whose base end portion is fixed to the metallic shell () and which has an annular portion (A) formed at a forward end portion thereof, the center electrode () being disposed radially inward of the annular portion (A), and an annular tip () which is joined to the inner circumference of the annular portion (A) and which forms a spark discharge gap () between the center electrode () and the inner circumferential surface of the annular tip (). Recesses () are provided on at least one of the inner and outer circumferences of the annular portion (A).