Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2008-01-29
2008-01-29
Santiago, Mariceli (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S143000, C313S144000, C123S1690EL
Reexamination Certificate
active
07323811
ABSTRACT:
A noble metal tip20for attachment to a spark plug center electrode36and/or a ground electrode. Noble metal tip20is a generally cylindrical component that includes a firing end40, an attachment end42, and one or more retention features44, 46and60, 62. The retention features are generally conically shaped holes or recesses formed in the side of the noble metal tip, and are designed to receive molten material during a laser attachment process. Once the molten material has solidified in the retention features, a fusion layer is formed and acts as a mechanical bond or interlock between the noble metal tip and the electrode. Methods of manufacturing and attaching the noble metal tips are also provided.
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Orjela Gurdev
Tinwell Paul
Federal-Mogul Ignition (U.K.) Limited
Reising Ethington Barnes Kisselle P.C.
Santiago Mariceli
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