Variable pitch resistance coil heater
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United States of America Patent
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May 17, 2016
Grant Date -
Oct 8, 2015
app pub date -
Jun 19, 2015
filing date -
May 25, 2012
priority date (Note) -
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Abstract
A heater is provided that includes a resistance coil assembly defining a first end portion having a first conducting pin and a second end portion having a second conducting pin, and a resistance coil disposed between the first end portion and the second end portion, and a first zone adjacent the first end portion with a constant pitch. The resistance coil further defines a continuously variable pitch extending along a length of the resistance coil from the first zone to the second end portion. The continuously variable pitch provides a variable watt density such that a predetermined temperature profile is provided along the sheath.
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