US PATENT SUBCLASS 34 / 552
.~.~.~ By steam pressure or temperature

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
524  DF  .~ With automatic control {11}
549  DF  .~.~ Of heater {7}
552.~.~.~ By steam pressure or temperature

DEFINITION

Classification: 34/552

By steam pressure or temperature:

(under subclass 549) Apparatus wherein the heater is controlled by varying the force of heated water vapor or its temperature.