Granted Patent
Utility
US 5,885,327 · App. 08/708,479
Process for the recovery of gold
Inventor:
Michael J. Virnig
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Sep 5, 1996
Inventor
Michael J. Virnig
Assignee (at issue)
Henkel 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.