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:
Dec. 10, 2002
Filed:
May. 23, 2000
Applicant:
Inventors:
Assignee:
Denso Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 8/04 ; C03C 3/066 ;
U.S. Cl.
CPC ...
C03C 8/04 ; C03C 3/066 ;
Abstract
A lead-free glaze that can be fired at a low temperature, a spark plug for which it is used, and a spark plug production method are provided. The lead-free glaze is for coating onto ceramic materials. This lead-free glaze contains 16-49 wt % of SiO , 15-35 wt % of B O , 0-10 wt % of Al O and 0-10 wt % of ZnO. A spark plug is provided that comprises coating the lead-free glaze onto the surface of an insulator and firing.