Spark plug with a ground electrode concentrically disposed to a central electrode and having precious metal on firing surfaces
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United States of America Patent
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Jul 4, 1995
Issued Date -
N/A
app pub date -
Nov 9, 1993
filing date -
Oct 13, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spark plug for an internal combustion engine wherein a ring shaped ground electrode has a uniform annular hole with an internal diameter about 0.80 to 1.25 times the outer diameter of the center electrode. The ground electrode is vertically spaced below the center electrode and is concentric therewith. The ground electrode is connected to one or more mounting posts attached to a spark plug metal housing. Firing surfaces of the ground and center electrode have platinum alloy inserts laser welded in place. The spark from the center electrode to the ground electrode has multiple paths and results in a spark plug which improves fuel combustion, increases gasoline mileage and engine horsepower and torque and significantly reduces the smolder time or ignition delay time and consequently reduces environmental pollutants of nitrogen oxide, carbon monoxide and other hydrocarbons.
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