US PATENT SUBCLASS 34 / 300
.~.~.~.~ Using filter

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

282  DF  PROCESS {24}
284  DF  .~ Freeze-drying {3}
298  DF  .~.~ With gas or vapor treating {2}
299  DF  .~.~.~ Desiccant or molecular sieve {1}
300.~.~.~.~ Using filter

DEFINITION

Classification: 34/300

Using filter:

(under subclass 298) Process wherein the gas or vapor derived from the freeze-drying process is subjected to a straining process primarily to remove particulate material.