Granted Patent
Utility
US 4,834,951 · App. 07/101,691
Common separation of contaminating elements from electrolyte solutions of valuable metals
Inventors:
Werner Schwab, Ralf Kehl
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Sep 25, 1987
Inventors
Werner Schwab
Ralf Kehl
Assignees (at issue)
Yokogawa Electric Corporation
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
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.