Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2008-06-20
2011-11-08
Cuff, Michael (Department: 3783)
Internal-combustion engines
Igniters
Sparkers
C123S193500, C123S14300R, C123S14650R, C313S141000
Reexamination Certificate
active
08051822
ABSTRACT:
A spark plug and cylinder head assembly includes a spark plug and a cylinder head of an engine. The cylinder head has a bore and a surface which faces a combustion chamber of the engine and on which the bore opens. The spark plug is fit in the bore of the cylinder head, and includes a metal shell, an insulator retained in the metal shell, a center electrode secured in the insulator, and a ground electrode facing the center electrode through a spark gap. An end surface of the metal shell has an outer edge and an inner edge, and tapers from the outer edge to the inner edge in a direction toward the inside of an air pocket formed between the metal shell and the insulator. The outer edge of the end surface of the metal shell protrudes from the surface of the cylinder head into the combustion chamber.
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Japanese Office Action dated May 19, 2009, issued in corresponding Japanese Application No. 2007-165195, with English translation.
Shibata Masamichi
Yorita Hiroshi
Cuff Michael
Denso Corporation
Nguyen Hung Q
Nippon Soken Inc.
Nixon & Vanderhye PC
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