US PATENT SUBCLASS 423 / 532
.~.~ Sulfur trioxide

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}
532.~.~ Sulfur trioxide {1}
533  DF  .~.~.~> Utilizing catalyst in reaction {4}

DEFINITION

Classification: 423/532

(under subclass 512.1) Products or processes wherein the compound is sulfur trioxide (SO3).