Spark plug with an improved seal

Details Spark plug with an improved seal Spark plug with an improved seal

2011-06-28

2011-06-28

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Plural part insulating means

C313S143000, C123S1690EB

Reexamination Certificate

active

07969077

ABSTRACT:
A spark plug having a glass seal formed from a first glass material and a second glass material. The first glass material has a glass transition temperature/softening point that is greater than the glass transition temperature/softening point of the second glass material. The first glass material and second glass material form a matrix and when combined with a filler have thermal expansion rates and properties the approximate leaded glass.

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