US PATENT SUBCLASS 423 / 335
.~.~ Silica


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

324  DF  SILICON OR COMPOUND THEREOF {4}
325  DF  .~ Oxygen containing {2}
335.~.~ Silica {5}
336  DF  .~.~.~> By hydrolyzing vapor phase silicon compound
337  DF  .~.~.~> By oxidizing volatile silicon compound (e.g., combustion, etc.)
338  DF  .~.~.~> By gelling
339  DF  .~.~.~> By precipitating
340  DF  .~.~.~> By purifying sand


DEFINITION

Classification: 423/335

(under subclass 325) Products or processes in which the product is silicon dioxide (Si O2).