US PATENT SUBCLASS 423 / 271
.~.~ Additive contains metal, boron, or silicon

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

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

DEFINITION

Classification: 423/271

(under subclass 270) Products or processes in which the substance is a metal, boron or silicon, or a compound thereof.