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:
Oct. 09, 1984
Filed:
Oct. 08, 1981
Applicant:
Inventors:
Assignees:
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313130 ; 3131 / ; 313137 ;
Abstract
A spark plug having center and ground electrodes. One of the electrodes is covered with an insulator, a part of which includes outer and inner insulating layers. The outer insulating layer is formed of a heat-resistant and high voltage-resistant material. The inner insulating layer is formed of a material having a high dielectric constant and interposed between the outer insulating layer and the portion of the one electrode which is directed toward the other electrode.