US PATENT SUBCLASS 34 / 406
.~ Gas or vapor pressure is subatmospheric

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

282  DF  PROCESS {24}
406.~ Gas or vapor pressure is subatmospheric {3}
407  DF  .~.~> With condensation of vapor {1}
409  DF  .~.~> Including addition of treating agent {2}
412  DF  .~.~> With heating

DEFINITION

Classification: 34/406

Gas or vapor pressure is subatmospheric:

(under subclass 282) Process wherein the treated material is subjected to a constant below-atmospheric pressure in at least one treating vessel during treating.

(1) Note. This subclass differs from subclass 403 in that subclass 403 has a variable pressure level, where the pressure levels in this subclass are constant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

87+, for freezing of treated material by vacuum.