Spark plug

Details Spark plug Spark plug

2008-05-06

2008-05-06

Nguyen, Kimberly D. (Department: 2809)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C123S1690EL

Reexamination Certificate

active

11014830

ABSTRACT:
A spark plug including: an insulator having an axial hole; a center electrode disposed in a tip end side of the axial hole of the insulator; a metal shell surrounding the insulator, a first ground electrode having one end bonded to the metal shell; a noble metal tip joined to an inner side face of another end portion of the first ground electrode body disposed opposite a tip end face of the center electrode; and a second ground electrode having one end bonded to the metal shell, and another end face disposed opposite a side peripheral face of said insulator to form a second discharge gap, wherein following relationships are satisfied as defined herein: 0.12≦S≦1.15, 0.3≦t≦1.5, A+0.7(F−A)≦1.8M, and −03≦L/H.

REFERENCES:
patent: 5502352 (1996-03-01), Katoh et al.
patent: 6229253 (2001-05-01), Iwata et al.
patent: 6819032 (2004-11-01), Matsubara
patent: 6831397 (2004-12-01), Kanao et al.
patent: 6956319 (2005-10-01), Hanashi et al.
patent: 2000-68032 (2000-03-01), None
patent: 2001-237045 (2001-08-01), None
patent: 2002-313524 (2002-10-01), None

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