Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Reexamination Certificate
2008-01-22
2008-01-22
Santiago, Mariceli (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
C313S142000, C313S143000, C313S144000
Reexamination Certificate
active
07321187
ABSTRACT:
A ground-electrode spark portion32is formed from a noble metal which contains Pt as a main component, and is joined to a main metal portion of the ground electrode4via an alloy layer which has a thickness ranging from 0.5 μm to 100 μm and in which the noble metal that constitutes the ground-electrode spark portion32and the metal that constitutes the main metal portion of the ground electrode4are alloyed with each other. The ground-electrode spark portion32is configured such that a distal end surface32tfacing a spark discharge gap g is smaller in diameter than a bottom surface32ujoined to the ground electrode4; and the distal end surface32tis protrusively located beyond the side surface4sof the ground electrode4. When the ground-electrode spark portion32is viewed in plane from the distal end surface32t, a portion of the surface of the ground-electrode spark portion32is viewed as a peripheral exposed-region surface32pwhich is exposed on the side surface4sof the ground electrode4so as to surround the distal end surface32t.
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Kato Tomoaki
Teramura Hideki
Torii Kazuyoshi
Díaz José M
NGK Spark Plug Co. Ltd.
Santiago Mariceli
Sughrue Mion Pllc.
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