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:
May. 16, 2000
Filed:
Nov. 14, 1996
Applicant:
Inventor:
Junichi Kagawa, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ; F02P / ; H01T / ; H01T / ;
U.S. Cl.
CPC ...
313141 ; 313118 ; 313140 ; 1231 / ;
Abstract
In order to provide a multielectrode spark plug which is excellent in resistance to fouling and in which the voltage required for producing a spark can be lowered, the tip portion of at least one of plural ground electrodes is positioned by the side of an annular front end face of an insulator to form a semi-creeping spark discharging gap elongating along the surface of the insulator with the tip portion of a center electrode, and the tip portions of the ground other electrodes form aerial spark discharging gaps with the tip portion of the center electrode.