Low electromagnetic and electrostatic field radiating heater cable
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United States of America Patent
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-
Apr 27, 1993
Grant Date -
N/A
app pub date -
Oct 1, 1990
filing date -
Oct 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coaxial-type heater cable is described for significantly reducing both electromagnetic and electrostatic field while maintaining a flexible heater cable structure by enclosing coaxial arranged inner and outer conductors with a conductive polymer layer that is in electrical contract with the outer conductor. The outer conductor is helically wrapped around the inner conductor with the number of turns per unit length selected to significantly reduce the electromagnetic field emanating from the heater cable while the conductive polymer layer significantly attenuates any electrostatic field that would otherwise fringe through spaces between successive turns of the outer conductor. The heater cable can be of the self-regulating type using a PTC material in electrical contact with and between the inner and outer conductors.
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Family
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Cited Art Landscape
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