US PATENT SUBCLASS 126 / 582
.~.~.~ Phase change sensor

Current as of: June, 1999
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126 /   HD   STOVES AND FURNACES

569  DF  SOLAR HEAT COLLECTOR {18}
572  DF  .~ With control means energized in response to actuator stimulated by condition sensor {3}
573  DF  .~.~ Including sun position tracking sensor {7}
582.~.~.~ Phase change sensor

DEFINITION

Classification: 126/582

Phase change sensor:

(under subclass 573) Apparatus wherein the sensing means includes a device which detects a transformation of state of substance (e.g., from solid to liquid or from liquid to gas).