Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

2007-01-18

2009-10-20

Won, Bumsuk (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S141000, C123S1690EL

Reexamination Certificate

active

07605526

ABSTRACT:
A spark plug for an internal combustion engine is disclosed having a metal shell having an outer periphery formed with a mounting thread, a porcelain insulator fixedly secured to the metal shell on a central axis thereof, a center electrode retained within the porcelain insulator along a central axis thereof with a distal end located outside the porcelain insulator, and a ground electrode joined to the metal shell and having an end associated with the distal end of the center electrode to define therebetween a spark discharge gap. The ground electrode includes a facing surface intersecting the central axis of the center electrode and having a width equal to or less than 1.6 mm.

REFERENCES:
patent: 6707237 (2004-03-01), Teramura et al.
patent: 2003/0038575 (2003-02-01), Hori et al.
patent: 2003/0071552 (2003-04-01), Teramura et al.
patent: 2004/0041506 (2004-03-01), Teramura et al.
patent: 2005/0057134 (2005-03-01), Kanao et al.
patent: 2005/0168120 (2005-08-01), Kanao et al.
patent: 2006/0213474 (2006-09-01), Sugiyama et al.
patent: 2001-307858 (2001-11-01), None

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