US PATENT SUBCLASS 423 / 529
.~.~.~.~ Subjecting reactants to pressure, vacuum, or steam

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

511  DF  SULFUR OR COMPOUND THEREOF {4}
512.1  DF  .~ Oxygen containing {11}
521  DF  .~.~ Ternary compound containing hydrogen {1}
522  DF  .~.~.~ Sulfuric acid {5}
529.~.~.~.~ Subjecting reactants to pressure, vacuum, or steam

DEFINITION

Classification: 423/529

(under subclass 522) Processes wherein the pressure on the reactants or sulfuric acid is caused to be increased to above atmospheric or to be decreased to below atmospheric, or water vapor from an external source is caused to contact the reactants or acid.

(1) Note. Included under this definition is the step of causing the water vapor to discharge against the surface of the reactants or acid of of providing an atmosphere of water vapor above the reactants or acid.