Granted Patent
Utility
US 6,171,564 · App. 09/134,086
Process for extraction of metal from an ore or concentrate containing nickel and/or cobalt
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Aug 14, 1998
Inventor
David L. Jones
Assignee (at issue)
Cominco Engineering Services Ltd.
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.