Spark plug having improved configuration of ground electrode...

Details Spark plug having improved configuration of ground electrode... Spark plug having improved configuration of ground electrode...

2007-10-26

2010-10-05

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C123S1690EL

Reexamination Certificate

active

07808166

ABSTRACT:
A spark plug includes a metal shell, an insulator, a center electrode, and a ground electrode. The ground electrode includes an intermediate portion extending in the axial direction of the center electrode in an axial range between an end of the insulator and an end of the center electrode. The intermediate portion has a thickness surface that is perpendicular to a radial direction of the center electrode and defines a thickness of the intermediate portion in a thicknesswise direction that is perpendicular to both the axial and radial directions of the center electrode. The intermediate portion also has a width surface that is perpendicular to the thickness surface and defines a width of the intermediate portion in a widthwise direction that is perpendicular to both the thicknesswise direction and the axial direction of the center electrode. The thickness of the intermediate portion is smaller than the width of the same.

REFERENCES:
patent: 4267481 (1981-05-01), Sauder
patent: 4484101 (1984-11-01), Ibbott
patent: 6094000 (2000-07-01), Osamura et al.
patent: 6262522 (2001-07-01), Osamura et al.
patent: 2002/0158559 (2002-10-01), Sugiyama et al.
patent: S55-128285 (1980-10-01), None
patent: S56-102089 (1981-08-01), None
patent: UM S57-194289 (1982-12-01), None
patent: H09-007733 (1997-01-01), None
patent: H09-148045 (1997-06-01), None

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