Granted Patent
Utility
US 5,336,474 · App. 07/956,317
Process for leaching of precious metals
Inventors:
Manfred Diehl, Karl-Heinz Koenig, Eckhart Krone, Juergen Loroesch, Norbert Steiner, Jochen Ullmann, Annette Ziegler
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Oct 6, 1992
Inventors
Manfred Diehl
Karl-Heinz Koenig
Eckhart Krone
Juergen Loroesch
Norbert Steiner
Jochen Ullmann
Annette Ziegler
Assignee (at issue)
Degussa AG
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.