Ignition device having an electrode tip formed from an...

Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing

Reexamination Certificate

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C313S118000, C313S143000

Reexamination Certificate

active

07352120

ABSTRACT:
An ignition device such as a spark plug having ground and center electrodes, at least one of which includes a firing tip formed from an alloy containing iridium, rhodium, tungsten, and zirconium. With the inclusion of tungsten and zirconium in the alloy, the percentage of rhodium can be kept relatively low without sacrificing the erosion resistance or reduced sparking voltage of the firing tip. In one embodiment, the firing tip contains 2% rhodium, 0.3% tungsten, 0.02% zirconium, and the balance iridium.

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