Granted Patent
Utility
US 5,078,860 · App. 07/651,315
Sequential and selective flotation of sulfide ores containing copper and molybdenum
Inventors:
Harold M. Ray, John C. Morrisey, IV
Patented Case
View Patent ↗
Granted: Jan 7, 1992
Filed: Feb 6, 1991
Inventors
Harold M. Ray
John C. Morrisey, IV
Assignee (at issue)
The Doe Run Company
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.