Sparkplug for an internal combustion engine

Details Sparkplug for an internal combustion engine Sparkplug for an internal combustion engine

2011-03-29

2011-03-29

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S136000

Reexamination Certificate

active

07915795

ABSTRACT:
A spark plug for an internal combustion engine of a motor vehicle, having a substantially cylindrical general form, includes an essentially capacitive lower part and an essentially inductive upper part. The lower part includes two coaxial electrodes, including a central electrode with an axis and a shell electrode that surrounds the central electrode, and an insulator inserted between the central electrode and the shell electrode. The upper part includes a central mandrel surrounded by a coil, a bottom end part of which overlaps a top end part of the central electrode in a radial direction, an external casing, and an insulator inserted radially between the casing and the coil. The top end part of the central electrode has a coating of material which is more electrically conductive than the material of the central electrode and has no ferromagnetic properties.

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U.S. Appl. No. 11/993,930, filed Dec. 26, 2007, Jaffrezic, et al.
U.S. Appl. No. 12/064,472, filed Feb. 22, 2008, Jaffrezic, et al.

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