Spark plug
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United States of America Patent
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Mar 4, 2014
Grant Date -
Nov 22, 2012
app pub date -
Jan 11, 2011
filing date -
Oct 26, 2010
priority date (Note) -
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Abstract
A spark plug including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode, the ground electrode has an outer layer which is formed from an Ni-based alloy and a core portion which is covered by the outer layer and formed from a material having a thermal conductivity higher than that of the outer layer. Further, the melting point of the Ni-based alloy forming the outer layer is 1150° C. or more and 1350° C. or less.
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