US PATENT SUBCLASS 165 / 251
.~.~.~.~.~ Enthalpy sensor

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}
201  DF  .~ Having heating and cooling capability {13}
248  DF  .~.~ Flow of air from outdoors controlled (e.g., minimum outside air, etc.) {2}
249  DF  .~.~.~ Proportion of outdoor air and return air controlled {1}
250  DF  .~.~.~.~ Outdoor air used in lieu of operating heating or cooling means (e.g., economy cycle, etc.) {1}
251.~.~.~.~.~ Enthalpy sensor

DEFINITION

Classification: 165/251

Enthalpy sensor:

(under subclass 250) Subject matter and further including a sensor which senses temperature and humidity of air.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, digest 13 for humidithermostat.