US PATENT SUBCLASS 423 / 159
.~.~.~ Subjecting mixture to pressure, vacuum, or steam

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

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
155  DF  .~ Alkaline earth metal (Mg, Ca, Sr, or Ba) {11}
158  DF  .~.~ Forming insoluble substance in liquid {8}
159.~.~.~ Subjecting mixture to pressure, vacuum, or steam

DEFINITION

Classification: 423/159

(under subclass 158) Processes wherein a chemical reaction takes place while the pressure on the mixture is either higher or lower than atmospheric; or while steam or water vapor is brought into contact with the mixture.

(1) Note. Pressure increase or decrease can be effected by any means, e.g., submerged blast of a gas into a liquid or a slurry, pumping of the liquid or slurry, increase or decrease on pressure of the gas space above a liquid surface.