Granted Patent
Utility
US 4,632,701 · App. 06/707,710
Process for the recovery of silver from a residue essentially free of elemental sulphur
Inventors:
Roman M. Genik-Sas-Berezowsky, Donald R. Weir
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Mar 4, 1985
Inventors
Roman M. Genik-Sas-Berezowsky
Donald R. Weir
Assignee (at issue)
Sherritt Gordon Mines Limited
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.