Spark plug

Details Spark plug Spark plug

2008-04-01

2008-04-01

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C313S140000, C445S007000

Reexamination Certificate

active

07352121

ABSTRACT:
A spark plug having a protrusion amount t of not smaller than 0.3 mm and satisfying a relation θ1+θ2≦93° in which θ1is an included angle between virtual lines s1and s2, and θ2is an included angle between virtual lines s3and s4when the virtual line s1is taken as a line parallel to a direction of an axis and including the other end side edge on a leading end surface of a first precious metal tip, the virtual line s2is taken as a line connecting the other end side edge and a point of intersection between an inner circumferential surface of a ground electrode body and the other end surface of the ground electrode body, the virtual line s3is taken as a line parallel to the direction of the axis and including the other end side edge on a leading end surface of a center electrode, and the virtual line s4is taken as a line including the other end side edge and tangent to an insulator.

REFERENCES:
patent: 4439707 (1984-03-01), Hattori et al.
patent: 2001/0029916 (2001-10-01), Kanao
patent: 2002/0003389 (2002-01-01), Ishiguro
patent: 2002/0038992 (2002-04-01), Morita et al.
patent: 2002/0067111 (2002-06-01), Shibata et al.
patent: 2002/0105254 (2002-08-01), Hori et al.
patent: 2003/0038577 (2003-02-01), Hori et al.
patent: 2003/0155849 (2003-08-01), Hori
patent: 2003/0193282 (2003-10-01), Shibata et al.
patent: 56-153677 (1981-11-01), None
patent: 2001-345162 (2001-12-01), None

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