Granted Patent
Utility
US 5,833,937 · App. 08/953,426
Polymeric combinations used as copper and precious metal heap leaching agglomeration aids
Inventor:
E. Michael Kerr
Patented Case
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Granted: Nov 10, 1998
Filed: Oct 17, 1997
Inventor
E. Michael Kerr
Assignee (at issue)
Nalco Chemical Company
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.