US PATENT SUBCLASS 423 / 539
.~.~ Sulfur dioxide

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}
539.~.~ Sulfur dioxide {4}
540  DF  .~.~.~> From acid sludge or waste
541.1  DF  .~.~.~> Utilizing metal sulfate as reactant {1}
542  DF  .~.~.~> Burning or roasting a sulfur compound
543  DF  .~.~.~> Burning sulfur

DEFINITION

Classification: 423/539

(under subclass 512.1) Products or processes in which the compound is sulfur dioxide (SO2).