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. 14, 1984
Filed:
Mar. 04, 1982
Applicant:
Inventors:
Assignees:
Nippondenso Co., Ltd., Kariya, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313136 ; 313141 ; 313142 ;
Abstract
A spark plug for internal combustion engines has center and grounded electrodes having surfaces disposed adjacent to a spark gap between the electrodes and directed to but spaced from each other and also have side faces converging toward the spark gap. Each of the electrodes is provided with a piece of a noble metal secured to the surface directed to the other electrode. The noble metal pieces provided on both electrodes define the spark gap therebetween.