US PATENT SUBCLASS 62 / 621
.~.~.~.~ Flowline expansion engine

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}
618  DF  .~.~ Natural gas {5}
620  DF  .~.~.~ Distillation {9}
621.~.~.~.~ Flowline expansion engine {1}
622  DF  .~.~.~.~.~> Downstream of column

DEFINITION

Classification: 62/621

Flowline expansion engine:

(under subclass 620) Subject matter wherein the refreigeration circuit comprises a flow line having means to convert the energy of expansion into mechanical energy.

SEE OR SEARCH CLASS

415, Rotary Kinetic Fluid Motors or Pumps, appropriate subclass for a turbine not specialized for refrigeration.