US PATENT SUBCLASS 423 / 270
.~ For sulfur trioxide

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

265  DF  WITH ADDITIVE {7}
270.~ For sulfur trioxide {1}
271  DF  .~.~> Additive contains metal, boron, or silicon

DEFINITION

Classification: 423/270

(under subclass 265) Products or processes in which the product is sulfur trioxide (SO3).

(1) Note. The substance is usually added for the purpose of preventing polymerization of the SO3.

SEE OR SEARCH THIS CLASS, SUBCLASS:

532+, for sulfur trioxide, per se, and processes for its manufacture.