Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2006-12-19
2006-12-19
Argenbright, T. M. (Department: 3747)
Internal-combustion engines
Igniters
Sparkers
C313S141000, C313S142000
Reexamination Certificate
active
07150252
ABSTRACT:
In a spark plug100, the nickel content of a center electrode20is greater than that of a ground electrode30. This enhances resistance to spark-induced consumption of the center electrode20. Also, the ground electrode30to which a noble-metal chip91is joined exhibits high resistance to spark-induced consumption. Accordingly, the spark plug100can be attached to either of a negative-polarity cylinder in which the center electrode20assumes a negative polarity, and a positive-polarity cylinder in which the center electrode20assumes a positive polarity. The noble-metal chip91is joined only to the ground electrode30, and a noble-metal chip is not joined to the center electrode20.
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Nakayama Katsutoshi
Sugiyama Yoshihisa
Wakamatsu Takeru
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
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