Spark plug and method of producing spark plug

Details Spark plug and method of producing spark plug Spark plug and method of producing spark plug

2006-11-07

2006-11-07

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C445S007000

Reexamination Certificate

active

07132782

ABSTRACT:
A spark plug includes a center electrode, a ground electrode opposing the center electrode in such a manner as to define a spark discharge gap between the center electrode and the ground electrode, and an igniter fixed to at least one of the center electrode and the ground electrode in such a manner as to face the spark discharge gap. The igniter is composed of a metallic material whose principal component is one of a platinum and an iridium. One type of the metallic material of the igniter contains an oxygen content of not more than 120 ppm. Another type of the metallic material of the igniter has a crystal grain of not less than 50 μm in mean diameter, and contains the oxygen content of not more than 300 ppm.

REFERENCES:
patent: 6045424 (2000-04-01), Chang et al.
patent: 6215234 (2001-04-01), Abe et al.
patent: 0 805 534 (1997-11-01), None
patent: 8-45643 (1996-02-01), None
patent: 11-154583 (1999-06-01), None
European Search Report for EP 01 11 5813 dated Oct. 16, 2001.
Patent Abstracts of Japan, vol. 1995, No. 3, Apr. 28, 1995 and JP 06 338 376 dated Dec. 6, 1994.

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