US PATENT SUBCLASS 34 / 82
.~.~.~ By filter

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

523  DF  APPARATUS {40}
72  DF  .~ With means to treat gas or vapor {3}
79  DF  .~.~ Separation of substances from treating or exhaust gases or vapors {2}
82.~.~.~ By filter

DEFINITION

Classification: 34/82

(under subclass 79) Apparatus in which the substances are removed by a filter.

SEE OR SEARCH THIS CLASS, SUBCLASS:

80, and 81, for means for passing gases or vapors through absorbing means which may also act to filter, or such means combined with a filter.

SEE OR SEARCH CLASS

55, Gas Separation, the subclasses beginning with

474, for filter media for gas separation.