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. 22, 2019
Filed:
Mar. 03, 2015
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Tsutomu Kobayashi, Inazawa, JP;
Tomoyuki Igarashi, Kusugai, JP;
NGK SPARK PLUG CO., LTD., Nagoya-shi, JP;
Abstract
A spark plug that satisfies the relation 2.8≤(A+B)/M, where A is the sum of a length Aof contact between a sheet packing and a metallic shell of a spark plug in one half section and a length Aof contact between the sheet packing and the insulator in the one half section, and B is the sum of a length Bof contact between the sheet packing and the metallic shell in the other half section and a length Bof contact between the sheet packing and the insulator in the other half section. M is the difference obtained by subtracting the inner diameter D of a ledge from the inner diameter C of a middle hole portion.