H - Electricity
01
T
H01T 13/38 (2006.01)
Patent
CA 2349228
A glaze layer 2d of the spark plug has the composition comprising 1 mol% or less of a Pb component in terms of PbO; 25 to 45 mol% of a Si component in terms of SiO2; 20 to 40 mol% of a B component in terms of B2O3; 5 to 25 mol% of a Zn component in terms of ZnO; 0.5 to 15 mol% of Ba and/or Sr components in terms of BaO or SrO; 5 to 10 mol% in total of at least one alkaline metal component of of Na, K and Li in terms of Na2O, K2O, and Li2, respectively, where K is essential; and further, 0.5 to mol% in total of one or two kinds or more of Mo, W, Ni, Co, Fe and Mn in terms of MoO3, WO3, Ni3O4, Co3O4, Fe2O3, and MnO2, respectively.
Kouge Yoshihide
Nishikawa Kenichi
Sugimoto Makoto
Ngk Spark Plug Co. Ltd.
Riches Mckenzie & Herbert Llp
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