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:
May. 20, 2003
Filed:
Jun. 29, 2001
Applicant:
Inventor:
Kenichi Nishikawa, Nagoya, JP;
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M 5/706 ; F02P 1/300 ; H01T 1/300 ;
U.S. Cl.
CPC ...
F02M 5/706 ; F02P 1/300 ; H01T 1/300 ;
Abstract
The glaze layer of the spark plug includes oxides of: 15 to 60 mol % of a Si component in terms of SiO ; 22 to 50 mol % of a B component in terms of B O ; 10 to 30 mol % of a Zn component in terms of ZnO; 0.5 to 35 mol % of Ba and/or Sr components in terms of BaO or SrO; 1 mol % or less of an F component; 0.1 to 5 mol % of an Al component in terms of Al O ; and 5 to 10 mol % in total of at least one of alkaline metal components of Na, K and Li, in terms of Na O, K O, and Li , respectively, wherein Li is essential, and the amount of the Li component is 1.1 to 6 mol % in terms of Li O.