Spark plug

Details Spark plug Spark plug

2007-08-28

2010-06-22

Patel, Ashok (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

C123S1690EL

Reexamination Certificate

active

07741763

ABSTRACT:
A spark plug including a center electrode; an insulator; a metal shell; a ground electrode; and an annular packing, all as defined herein, wherein the packing has a hardness greater than or equal to a hardness of the stepped portion of the metal shell or has a Vickers hardness of not less than 300 Hv. Preferably, a difference between the hardness of the packing and the hardness of the stepped portion of the metal shell is from 120 Hv to 160 Hv, and the packing has a Vickers hardness of not more than 500 Hv.

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patent: 2006-92956 (2006-04-01), None

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