Granted Patent
Utility
US 5,925,862 · App. 08/976,189
Process for the recovery of cobalt from ores containing metal sulfides
Inventors:
John C. Morrisey, IV, Quentin Schmidt
Patented Case
View Patent ↗
Granted: Jul 20, 1999
Filed: Nov 21, 1997
Inventors
John C. Morrisey, IV
Quentin Schmidt
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.