Spark plug with electrode including precious metal

Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing

Reexamination Certificate

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Details

C313S118000, C313S143000

Reexamination Certificate

active

10519075

ABSTRACT:
An object of the invention is to provide a higher-durability spark plug provided with a center electrode and a side electrode. At least one of the center electrode and the side electrode includes a precious metal member facing a spark discharge gap between the electrodes. A sweating phenomenon of the precious metal member can be suppressed while spark abrasion, oxidation abrasion and abnormal abrasion of the precious metal member are suppressed. The precious metal member contains Ir as a main component, and smaller amounts of Rh, Ru, and Ni.

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patent: 6121719 (2000-09-01), Matsutani et al.
patent: 6710523 (2004-03-01), Segawa et al.
patent: 6750598 (2004-06-01), Hori
patent: 6831397 (2004-12-01), Kanao et al.
patent: 2002/0067111 (2002-06-01), Shibata et al.
patent: 2003/0038576 (2003-02-01), Matsutani et al.
patent: 2003/0038577 (2003-02-01), Hori et al.
patent: 2003/0122461 (2003-07-01), Menken et al.
patent: 2003/0155849 (2003-08-01), Hori
patent: 2004/0027042 (2004-02-01), Matsutani et al.
patent: 1 231 687 (2002-08-01), None
patent: 09-007733 (1997-01-01), None
patent: 2002 359050 (2002-12-01), None
patent: A-2002-359051 (2002-12-01), None
patent: A-2003-68421 (2003-03-01), None

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