US PATENT SUBCLASS 34 / 402
.~ Gas or vapor pressure varies during treatment

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

282  DF  PROCESS {24}
402.~ Gas or vapor pressure varies during treatment {2}
403  DF  .~.~> Including subatmospheric pressure {1}
405  DF  .~.~> Including superatmospheric pressure

DEFINITION

Classification: 34/402

Gas or vapor pressure varies during treatment:

(under subclass 282) Process wherein treated material is subjected to a gas or vapor whose treatment pressure is

maintained at multiple levels in at least one closed treatment vessel during treating or the pressure is changed in a continuous or discontinuous manner during the treating process.

(1) Note. Varying of pressure does not include the change in treating pressure as a result of starting up or shutting down the gas or vapor treating process.

SEE OR SEARCH THIS CLASS, SUBCLASS:

284+, for a process including freezing by application of a vacuum plus other treating.

329+, for other liquid contact processes.