Granted Patent
Utility
US 5,223,024 · App. 07/901,097
Hydrometallurgical copper extraction process
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Jun 19, 1992
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.