Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2007-07-02
2009-08-04
Patel, Vip (Department: 2889)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S118000
Reexamination Certificate
active
07569978
ABSTRACT:
A spark plug having a particular firing end configuration that satisfies numerous dimensional ranges for improved performance. The spark plug generally includes a shell, an insulator, and center and ground electrodes, with the electrodes each having a copper core for improved thermal conductivity and a noble metal insert for improved erosion and corrosion resistance. The noble metal insert for the center electrode is preferably in the form of a cylindrical Ir-based tip, which is received within a complimentary recess formed in the center electrode. The noble metal insert for the ground electrode is in the form of a flat Pt-based pad attached to a surface of the ground electrode. Various dimensional ranges are provided for the various components of the spark plug assembly, both individually and in combination with other dimensions.
REFERENCES:
patent: 6548945 (2003-04-01), Tamura
patent: 7109646 (2006-09-01), Morita et al.
Federal-Mogul Ignition (U.K.) Limited
Patel Vip
Reising Ethington P.C.
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