Granted Patent
Utility
US 5,976,218 · App. 08/845,941
Process for the recovery of nickel
Inventors:
Michael J. Virnig, J. Murdoch MacKenzie
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: Apr 29, 1997
Inventors
Michael J. Virnig
J. Murdoch MacKenzie
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.