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:
Apr. 03, 1990
Filed:
Dec. 23, 1988
Applicant:
Inventors:
Junichi Kagawa, Aichi, JP;
Wataru Matsutani, Aichi, JP;
Alfred Krappel, Ismaning, DE;
Josef Holzmann, Munich, DE;
Johannes Guggenmos, Furstenfeldbruck, DE;
Assignees:
NGK Spark Plug Co., Ltd., Aichi, JP;
Bayerische Motoren Werke A.G., Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313139 ; 313141 ; 313142 ;
Abstract
The outer or side electrode of a spark plug is configured as a flat plate confronting the center electrode to define a gap, and fixed to the threaded shell or body of the plug by a plurality of spider legs. A plurality of holes are formed in the plate to improve the plug durability and retard any discharge voltage increases.