US PATENT SUBCLASS 423 / 555
.~.~.~.~ Calcium

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}
544  DF  .~.~ Sulfate {7}
554  DF  .~.~.~ Alkaline earth metal containing (Mg, Ca, Sr, or Ba) {1}
555.~.~.~.~ Calcium

DEFINITION

Classification: 423/555

(under subclass 554) Products or processes in which the metal is calcium.

SEE OR SEARCH THIS CLASS, SUBCLASS:

171, for processes of calcining gypsumwhich is primarily calcium dihydrate (CaSO4[end subscrpt].2H2O) to obtain plaster of paris which is primarily calcium hemihydrate (CaSO4.1/2H2[end subscrpt]O).