Glow plug and spark plug, and manufacturing method therefor

Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing

Reexamination Certificate

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Details

C313S143000, C313S144000, C313S145000

Reexamination Certificate

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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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Patent Abstract of Japan; Publication No. 01015397; Jan. 19, 1989, Suganuma Nobuyuki.
Patent Abstract of Japan, Publication No. 01015396, Jan. 19, 1989.

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