Granted Patent
Utility
US 4,290,866 · App. 06/086,877
Removal of manganese ions from zinc and manganese containing solutions
Inventors:
Gerald L. Bolton, Verner B. Sefton, Nicolaus Zubryckyj
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Oct 22, 1979
Inventors
Gerald L. Bolton
Verner B. Sefton
Nicolaus Zubryckyj
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.