US PATENT SUBCLASS 62 / 642
.~.~.~ Filtration

Current as of: June, 1999
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62 /   HD   REFRIGERATION

600  DF  CRYOGENIC TREATMENT OF GAS OR GAS MIXTURE {4}
617  DF  .~ Separation of gas mixture {3}
640  DF  .~.~ Air {3}
642.~.~.~ Filtration

DEFINITION

Classification: 62/642

Filtration:

(under subclass 640) Subject matter wherein the a constituent is extracted by passing through a porous medium.

SEE OR SEARCH CLASS

55, Gas Separation, appropriate subclasses beginning with 434 for apparatus, for gas-solid separation by deflection or filtration of general application.

95, Gas Separation: Processes,

273+, for processes of gas separation by filtering, per se.