US PATENT SUBCLASS 165 / 281
.~ Fluid pressure responsive or control

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}
281.~ Fluid pressure responsive or control {3}
282  DF  .~.~> Branched flow of heat exchange material {1}
285  DF  .~.~> Flow of one heat exchange material controlled by the pressure of another
286  DF  .~.~> Flow of one heat exchange material controlled by its own pressure

DEFINITION

Classification: 165/281

Fluid pressure responsive or control:

(under subclass 200) Subject matter wherein the heat transfer apparatus includes a heat exchange fluid, and further includes means to control the pressure of such fluid, or wherein the heat transfer apparatus includes a device responsive to fluid pressure to control the apparatus.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation,

92+, for thermostatic control of hot and cold with pressure control; appropriate subclasses for automatic temperature and humidity control devices.