Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2008-04-01
2008-04-01
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
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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Coupland Duncan Roy
Hyde Robin
Orjela Gurdev
Tinwell Paul
Federal-Mogul Ignition (U.K.) Limited
Johnson Matthey Public Limited Company
Patel Nimeshkumar D.
Quaterman Kevin
Reising Ethington Barnes Kisselle P.C.
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