Spark plug and ignition apparatus

Details Spark plug and ignition apparatus Spark plug and ignition apparatus

2005-01-18

2005-01-18

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C315S059000

Reexamination Certificate

active

06844662

ABSTRACT:
At least one of a center electrode tip and a ground electrode tip is made of an iridium alloy. A discharge gap, formed between the center electrode tip and the ground electrode tip, is less than 1.1 mm. And, cross sections of the center electrode tip and the ground electrode tip are equal to or smaller than 0.95 mm2in a spherical region where a distance from a midpoint of the discharge gap is within 0.6 mm.

REFERENCES:
patent: 5461275 (1995-10-01), Oshima
patent: 5898257 (1999-04-01), Sequerra et al.
patent: 6265814 (2001-07-01), Yoshinaga et al.
patent: 6304022 (2001-10-01), Matsutani
patent: 6346766 (2002-02-01), Kanao et al.
patent: 6412465 (2002-07-01), Lykowski et al.
patent: 52-36237 (1975-09-01), None
patent: 10-41047 (1998-02-01), None
patent: 11-204233 (1999-07-01), None

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