Spark plug
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United States of America Patent
Stats
-
Dec 14, 2004
Grant Date -
Mar 28, 2002
app pub date -
May 31, 2001
filing date -
May 31, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spark plug 100 has a glaze layer 2d formed on a surface of an alumina based insulator 2 contains 1 mol % or less of a Pb component in terms of PbO. The glaze layer 2d comprises 35 to 55 mol % of a Si component in terms of SiO.sub.2 ; 15 to 35 mol % of a B component in terms of B.sub.2 O.sub.3 ; 5 to 20 mol % of a Zn component in terms of ZnO; 0.5 to 20 mol % of a Ba component in terms of BaO; and 10 to 15 mol % in total of at least one alkaline metal component of Na, K and Li, in terms of Na.sub.2 O, K.sub.2 O and Li.sub.2 O, respectively.
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