US PATENT SUBCLASS 34 / 538
.~.~.~.~ With means to produce reduced or negative pressure

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}
526  DF  .~.~ Of plural operations {3}
535  DF  .~.~.~ Having two of heater, contacting gas humidity, or gas mixing {7}
538.~.~.~.~ With means to produce reduced or negative pressure

DEFINITION

Classification: 34/538

With means to produce reduced or negative pressure:

(under subclass 535) Apparatus wherein a means is provided to lessen the pressure or create a vacuum around an object being treated.