Spark plug

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8987981
APP PUB NO 20150002011A1
SERIAL NO

14317564

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A sparkplug includes a ground electrode forming a gap with a front end surface of the center electrode. A front end portion of the ground electrode includes an opposed surface facing the center electrode, and a pair of tapered surfaces sandwiching the opposed surface. A shortest distance between the center electrode and a boundary formed by the opposed surface and the tapered surface is equal to or less than 1.2 times a distance of the gap. At least a part of a cross section of the core portion is disposed in a region at a front side of the straight line that passes a rear end of a line segment corresponding to the tapered surface and is vertical to the line segment. A shortest distance between the line segment and the cross section of the core portion is 0.2 mm or more and 1.5 mm or less.

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First Claim

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Patent Owner(s)

  • NGK SPARK PLUG CO., LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imai, Susumu Inuyama, JP 32 184

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