Electric lamp and discharge devices – Spark plugs – Shaped electrode chamber – insulator end – shell skirt – baffle...
Reexamination Certificate
2009-01-28
2011-11-15
Macchiarolo, Peter (Department: 2879)
Electric lamp and discharge devices
Spark plugs
Shaped electrode chamber, insulator end, shell skirt, baffle...
Reexamination Certificate
active
08058786
ABSTRACT:
A small diameter spark plug configuration is provided, the configuration has been found to provide additional volume for the insulator member. That is, by limiting the overall number of threads on the intermediate portion along with a limit of the overall diameter of the spark plug, additional volume of insulator material may be achieved in an interior cavity of a metal shell of the spark plug. This additional volume enables a portion of the insulator member to have a larger diameter and hence greater material thickness. The larger diameter of the insulator provides enhanced dielectric properties and protects internal components of the spark plug from high combustion chamber temperatures while simultaneously providing a robust attachment of the spark plug with an engine head.
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International Search Report—PCT/US2009/032214 dated Sep. 7, 2009.
Written Opinion of the International Searching Authority—PCT/US2009/032214 dated Sep. 7, 2009.
Cantor & Colburn LLP
Fram Group IP LLC
Macchiarolo Peter
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