US PATENT SUBCLASS 165 / 289
.~.~.~ Means to maintain a constant temperature difference between a measured temperature and a controlled temperature

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

200  DF  WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14}
287  DF  .~ Temperature responsive or control {5}
288  DF  .~.~ Plural temperature sensors {6}
289.~.~.~ Means to maintain a constant temperature difference between a measured temperature and a controlled temperature

DEFINITION

Classification: 165/289

Means to maintain a constant temperature difference between a measured temperature and a controlled temperature:

(under subclass 288) Subject matter wherein a first of sensor means measures temperature at a first location and a second of said sensor means measures temperature at a second location; and wherein said controller is operated to maintain the temperature at said second location at a pre-determined difference in value with respect to said temperature at said first location.