Granted Patent
Utility
US 5,431,788 · App. 08/098,874
Chloride assisted hydrometallurgical copper extraction
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: Jul 11, 1995
Filed: Jul 29, 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.