US PATENT SUBCLASS 95 / 56
.~.~.~ Elemental metal or alloy barrier

Current as of: June, 1999
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95 /   HD   GAS SEPARATION: PROCESSES

43  DF  SELECTIVE DIFFUSION OF GASES {2}
45  DF  .~ Selective diffusion of gases through substantially solid barrier (e.g., semipermeable membrane, etc.) {10}
55  DF  .~.~ Hydrogen permeates barrier {1}
56.~.~.~ Elemental metal or alloy barrier

DEFINITION

Classification: 95/56

Elemental metal or alloy barrier:

(under subclass 55) Process in which hydrogen (H2) selectively diffuses through a substantially solid barrier that is made of elemental metal or alloy or contains a layer of elemental metal or alloy.

(1) Note. The hydrogen (H2) molecule may dissociate into hydrogen (H) atoms at the surface of the barrier. The atoms will then diffuse through the barrier and recombine into a hydrogen (H2) molecule on the downstream side of the barrier.

SEE OR SEARCH CLASS

210, Liquid Purification or Separation,

500.25, for a metal-containing semipermeable membrane used in liquid separation.

423, Chemistry of Inorganic Compounds,

658.2, for processes of producing elemental hydrogen (H) by direct decomposition of a binary compound (e.g., chemical storage, etc.).