US PATENT SUBCLASS 34 / 403
.~.~ Including subatmospheric pressure

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

282  DF  PROCESS {24}
402  DF  .~ Gas or vapor pressure varies during treatment {2}
403.~.~ Including subatmospheric pressure {1}
404  DF  .~.~.~> With addition of treating agent

DEFINITION

Classification: 34/403

Including subatmospheric pressure:

(under subclass 402) Process wherein the treated material is subjected to a below-atmospheric pressure during treating.

(1) Note. If subject matter is directed to freezing of treated material by vacuum, then the subject matter should be placed in subclasses 87+.