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:
Jun. 26, 1990
Filed:
May. 16, 1988
Applicant:
Inventor:
Yasutake Ishino, Kariya, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313143 ;
Abstract
A coating layer made of a heat-proof insulating material is formed on the surface of a leg, exposed to the interior of the engine, of a ceramic insulator of a sparking plug. The coating is formed of a mixed solution of silicone oil blended with a mixture of parafin and ozokerite. The mixed solution contains 100 weight percent of silicone oil blended with paraffin by at least 5 weight percent and ozokerite by at least 0.2 weight percent.