US PATENT SUBCLASS 96 / 9
.~.~ Barriers connected in series

Current as of: June, 1999
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96 /   HD   GAS SEPARATION: APPARATUS

4  DD  APPARATUS FOR SELECTIVE DIFFUSION OF GASES (E.G., SEMIPERMEABLE MEMBRANE, ETC.) {6}
7  DF  .~ Plural separate barriers {2}
9.~.~ Barriers connected in series

DEFINITION

Classification: 96/9

Barriers connected in series:

(under subclass 7) Apparatus in which at least two separate barriers are arranged in series for sequential gas diffusion or separation.