Spark plug

Details Spark plug Spark plug

2007-09-06

2010-11-02

Macchiarolo, Peter J (Department: 2879)

Electric lamp and discharge devices

Spark plugs

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

C313S118000

Reexamination Certificate

active

07825572

ABSTRACT:
A spark plug including a center electrode; an insulator; and a metal shell, wherein the metal shell includes: a mounting portion; a cylindrical portion; a seal portion; a crimping portion; and a buckled portion all as defined herein, and a relationship A<B is satisfied, in which A is a length in the axial direction of an external thread formed on the mounting portion, and B is a length of the cylindrical portion in the axial direction.

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Japanese Office Action dated Jan. 20, 2009.

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