Spark plug

Details Spark plug Spark plug

2007-05-29

2007-05-29

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000

Reexamination Certificate

active

11136393

ABSTRACT:
A ground electrode has one end portion fixed to a metal housing, a bent portion provided at an intermediate portion thereof, and the other end portion positioned in a confronting relationship with a center electrode to form a spark discharge gap. The ground electrode contains either Ni or Fe as a main component and at least one additive selected from the group consisting of Cr and Al. A cross-sectional area S of the ground electrode is not less than 2 mm2and not greater than 3 mm2. An average value D of crystal grain diameters in a thickness direction is not less than 100 μm at least at the bent portion.

REFERENCES:
patent: 6794803 (2004-09-01), Hori et al.
patent: 2002-343533 (2002-11-01), None

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