US PATENT SUBCLASS 423 / 357
.~.~.~ Utilizing calcium compound

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

351  DF  NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5}
352  DF  .~ Ammonia or ammonium hydroxide {6}
356  DF  .~.~ From ammonium compound {1}
357.~.~.~ Utilizing calcium compound

DEFINITION

Classification: 423/357

(under subclass 356) Processes in which a compound containing the element calcium (Ca-+) is used.