Granted Patent
Utility
US 5,316,567 · App. 08/035,233
Hydrometallurgical copper extraction process
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: Mar 22, 1993
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.