US PATENT SUBCLASS 165 / 280
.~.~ Bypass of heat exchanger responsive to both temperature and pressure


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}
279  DF  .~ Pressure and temperature responsive or control {1}
280.~.~ Bypass of heat exchanger responsive to both temperature and pressure


DEFINITION

Classification: 165/280

Bypass of heat exchanger responsive to both temperature and pressure:

(under subclass 279) Subject matter wherein the heat transfer apparatus comprises a heat exchanger having a fluid passing through it and an auxiliary passageway in parallel flow connection with the heat exchanger to permit the fluid to go around rather than through the heat exchanger, the auxiliary passageway having a means to control flow through it which is

responsive to both temperature and pressure.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation,

34.5, for automatic temperature and humidity control of cooling radiator having bypass; subclasses 92+ for thermostatic control of hot and cold with pressure control.