Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2004-08-04
2008-11-11
Roy, Sikha (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S142000, C313S118000, C123S1690EL, C123S1690EB
Reexamination Certificate
active
07449822
ABSTRACT:
A small-sized spark plug is provided which ensures the stability in the location of production of sparks between center and ground electrodes. The center and ground electrodes have joined thereon cylindrical members such as noble metal chips which are opposed to each other through a spark gap. The cylindrical members are so oriented to have longitudinal center lines extend parallel in misalignment with each other. This orientation results in shorter and longer intervals between end surfaces of the cylindrical members. The sparks are concentrated between portions of edges of cylindrical members located apart the shorter interval, thereby resulting in the stability in the location of production of the sparks.
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Japanese Information Offer Form in counterpart Japanese Application No. 2003-288826 with English translation.
Japanese Office Action dated May 22, 2007 issued in counterpart Japanese Application No. 2003-288826 with English translation.
Hori Tsunenobu
Morita Hitoshi
Okabe Shinichi
Yorita Hiroshi
DENSO Corporation
Nippon Soken Inc.
Nixon & Vanderhye PC
Roy Sikha
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