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:
Nov. 15, 1983
Filed:
Jul. 20, 1981
Applicant:
Inventors:
Hisao Mizuno, Aichi, JP;
Shunichi Takagi, Aichi, JP;
Kichio Nakahara, Aichi, JP;
Takahito Yamamota, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313118 ; 313143 ;
Abstract
A sparkplug having an improved antifouling performance and in which a decrease in insulation resistance is prevented, even if an electrically conductive material is deposited on the firing surface of the insulator of the sparkplug. In accordance with the invention, a coating of a solution of silicone and paraffin is formed on at least the portion of the firing surface of the porcelain insulator which is surrounded by the inner surface of the combustion chamber side of the metal casing of the sparkplug. Preferably, the coating is also formed on the inner surface of the metal casing.