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United States of America Patent
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-
Dec 15, 1992
Grant Date -
N/A
app pub date -
Nov 22, 1989
filing date -
Nov 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A product having a positive temperature coefficient of resistance is formed by etching a carbon black at an elevated temperature to remove less crystalline portions and thereby to increase the specific surface area of the carbon black. The resulting carbon black is called porous carbon black. The porous carbon black is blended with a crystalline polymer to form a product having the desired positive temperature coefficient of resistance. Production of a material suitable for use as a resettable fuse is described.
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