Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making
Reexamination Certificate
2005-01-25
2005-01-25
Williams, Joseph (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
Spark plug or spark gap making
Reexamination Certificate
active
06846214
ABSTRACT:
In a spark plug for an internal combustion engine, a noble metal chip such as an iridium alloy chip is bonded on the tip of a center electrode made of a material such as nickel by laser beam welding. The noble metal chip contains another noble metal such as rhodium having a melting point lower than that of the noble metal chip. By laser welding, a molten bond containing the noble metal melted thereinto from the noble metal chip is formed at the junction of the noble metal chip and the center electrode. Alternatively, the noble metal to be melted into the molten bond may be supplied by a separate noble metal plate. The molten bond thus made has a high bonding strength and a small thermal stress, and thereby durability of the spark plug is improved.
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Abe Nobuo
Gotou Tsunetoshi
Denso Corporation
Nixon & Vanderhye PC
Williams Joseph
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