US PATENT SUBCLASS 62 / 931
Recovery of hydrogen

Current as of: June, 1999
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62 /   HD   REFRIGERATION

931Recovery of hydrogen {3}
932  DF  .~> From natural gas
933  DF  .~> From helium
934  DF  .~> From nitrogen

DEFINITION

Classification: 62/931

Recovery of hydrogen:

Subject matter specific to the recovery of hydrogen gas from a gas mixture not provided for below.