Electric lamp and discharge devices – Spark plugs – Plural series gaps
Reexamination Certificate
2004-10-20
2008-10-28
Williams, Joseph L (Department: 2889)
Electric lamp and discharge devices
Spark plugs
Plural series gaps
C313S141000
Reexamination Certificate
active
07443088
ABSTRACT:
A spark plug having a pair of independent spark gaps includes a shell, inner and outer insulators, a cylindrical electrode assembly, a center wire assembly, and a pair of ground electrodes. The cylindrical electrode assembly is generally located between the two insulators and delivers a first high voltage ignition pulse to a first spark gap. The center wire assembly is located in an axial bore of the inner insulator and delivers a second high voltage ignition pulse to a second spark gap. The two insulators and two electrode assemblies are all coaxially aligned within the shell so that both insulators can be rotationally symmetrical. The first spark gap is radially oriented while the second spark gap is axially oriented, and the first and second spark gaps are located at different axial positions and can fire independently of one another. A method of assembling the spark plug is also disclosed.
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Dickinson Wright PLLC
Federal - Mogul World Wide, Inc.
Stearns Robert L.
Williams Joseph L
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