Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2007-10-09
2007-10-09
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S118000, C313S143000
Reexamination Certificate
active
10519075
ABSTRACT:
An object of the invention is to provide a higher-durability spark plug provided with a center electrode and a side electrode. At least one of the center electrode and the side electrode includes a precious metal member facing a spark discharge gap between the electrodes. A sweating phenomenon of the precious metal member can be suppressed while spark abrasion, oxidation abrasion and abnormal abrasion of the precious metal member are suppressed. The precious metal member contains Ir as a main component, and smaller amounts of Rh, Ru, and Ni.
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Matsubara Yoshihiro
Matsutani Wataru
Nunome Kenji
Yoshimoto Osamu
Morgan & Lewis & Bockius, LLP
NGK Spark Plug Co. Ltd.
Quarterman Kevin
Williams Joseph
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