US PATENT SUBCLASS 423 / 176
.~.~.~.~ Utilizing 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}
173  DF  .~.~ Treating impure carbonate (e.g., oyster shells, etc.) {2}
175  DF  .~.~.~ Calcining {2}
176.~.~.~.~ Utilizing vacuum or steam

DEFINITION

Classification: 423/176

(under subclass 175) Processes wherein the mixture is subjected to a pressure below atmospheric or the heat is supplied by steam or water vapor.