Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2006-05-16
2006-05-16
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S144000, C313S135000, C445S007000
Reexamination Certificate
active
07045939
ABSTRACT:
A spark plug used in an automotive internal combustion engine. The spark plug includes a center electrode. An insulator is disposed around the center electrode. A metal main body is disposed around the insulator. A ground electrode has a first end section connected to the metal main body, and a second end section located opposite to the center electrode. Additionally, a tip is formed of an alloy whose main component is Ir. The tip is secured to the ground electrode and serving as a spark consumption-resistant electrode material. The tip has an axis directed to the center electrode. In the spark plug, a molten and solidified section formed of alloy is disposed to fix the tip to the ground electrode. The molten and solidified section includes a surrounding molten and solidified section located surrounding a peripheral surface of a major part of the tip embedded in the ground electrode.
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EPO European Search Report for EP Application No. 02 00 6004 dated May 15, 2003.
Kondo Kiyohiro
Musasa Mamoru
Teramura Hideki
Dong Dalei
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
Williams Joseph
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