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


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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).