Granted Patent
Utility
US 5,275,791 · App. 07/899,060
Process for the leaching of gold and silver with cyanidic leaching solution and controlled addition of hydrogen peroxide
Inventors:
Helmut Knorre, Andrew Griffiths, Juergen Loroesch, Joachim Fischer
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: Jun 16, 1992
Inventors
Helmut Knorre
Andrew Griffiths
Juergen Loroesch
Joachim Fischer
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.