Granted Patent
Utility
US 6,455,019 · App. 09/866,027
Process for the extraction of copper from a sulphide copper ore or concentrate
Inventor:
David L. Jones
Patented Case
View Patent ↗
Granted: Sep 24, 2002
Filed: May 25, 2001
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.