Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2011-04-12
2011-04-12
Ton, Toan (Department: 2889)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
Reexamination Certificate
active
07923909
ABSTRACT:
An ignition device for an internal combustion engine and method of construction therefore includes a housing with an insulator secured therein. A center electrode is mounted within the insulator. A ground electrode extends from the housing with a portion of the ground electrode defining a spark gap across from the center electrode. At least a selected one of the center electrode or ground electrode has a platinum or platinum-based alloy firing tip. A resistance weld joint bonds the firing tip to the selected electrode and defines a lower surface of the firing tip that is embedded a first distance beneath an outer surface of the selected electrode. A continuous bead of overlapping laser weld pools is formed over an outer periphery of the firing tip. The overlapping weld pools extend a second distance beneath the outer surface of the selected electrode, with the second distance being greater than the first distance.
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Dickinson Wright PLLC
Featherly Hana S
Federal-Mogul World Wide Inc.
Stearns Robert L.
Ton Toan
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