Granted Patent
Utility
US 5,902,474 · App. 08/592,730
Chloride assisted hydrometallurgical extraction of metal
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Jan 26, 1996
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.