Granted Patent
Utility
US 4,334,918 · App. 06/128,719
Method of recovering non-ferrous metals from their sulphide ores
Inventor:
Noel A. Warner
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Mar 10, 1980
Inventor
Noel A. Warner
Assignee (at issue)
501 National Research Development Corp.
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.