Granted Patent
Utility
US 5,758,255 · App. 08/699,323
Opposite phase entrainment reduction in solvent extraction/electrowinning circuits by addition of water soluble cationic polymers
Inventors:
E. Michael Kerr, Kenneth Malcolm Smith
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Aug 19, 1996
Inventors
E. Michael Kerr
Kenneth Malcolm Smith
Assignee (at issue)
Nalco Chemical 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.