US PATENT SUBCLASS 423 / 534
.~.~.~.~ Promoter or successive diverse catalysts

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  DF  .~.~ Sulfur trioxide {1}
533  DF  .~.~.~ Utilizing catalyst in reaction {4}
534.~.~.~.~ Promoter or successive diverse catalysts

DEFINITION

Classification: 423/534

(under subclass 533) Processes wherein a second different and distinct catalyst is employed in series with the first catalyst, or wherein a substance which increases the efficiency of the catalyst is utilized.