Glow plug and spark plug, and manufacturing method therefor

Details Glow plug and spark plug, and manufacturing method therefor Glow plug and spark plug, and manufacturing method therefor

2006-10-17

2006-10-17

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C313S144000, C313S145000

Reexamination Certificate

active

07122947

ABSTRACT:
In a glow plug and a spark plug, the surface of a main metal shell is coated with a chromate film in which the quantity of trivalent chrome is 95 wt % or more of the contained chrome components and which has a thickness of 0.2 μm to 0.5 μm.

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