US PATENT SUBCLASS 423 / 540
.~.~.~ From acid sludge or waste

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  DF  .~.~ Sulfur dioxide {4}
540.~.~.~ From acid sludge or waste

DEFINITION

Classification: 423/540

(under subclass 539) Processes which include as the initial feedstock sludge or other waste material resulting from the acid treatment of a substance.

(1) Note. Many of the patents herein use a sludge which results from the acid treatment of an organic substance (e.g., paper).