Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2007-05-22
2007-05-22
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S142000, C313S143000, C313S144000, C313S145000
Reexamination Certificate
active
10854365
ABSTRACT:
In a spark plug composed of a center electrode and an earth electrode, at least one of confronting portions of the center electrode and the earth electrode which are in opposed relation to each other is constructed with a noble metal chip containing Pt as a principal component. The noble metal chip is joined to an electrode base material of the center electrode or the earth electrode and is made of an alloy comprising Pt and another element. In this noble metal chip, Pt is contained as a first component, while Re is contained as a second component. The employment of this noble metal chip enables suppressing the growth of platinum balls even in a high-temperature atmosphere.
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Denso Corporation
Nixon & Vanderhye PC
Sanei Hana Asmat
Williams Joseph
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