Granted Patent
Utility
US 4,331,469 · App. 06/179,613
Process for the recovery of silver values from silver-containing material which also contains iron and arsenic
Inventor:
Wasyl Kunda
Patented Case
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Granted: May 25, 1982
Filed: Aug 19, 1980
Inventor
Wasyl Kunda
Assignee (at issue)
Sherritt Gordon Mines Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.