Granted Patent
Utility
US 5,260,039 · App. 07/776,230
Process for the two-phase extraction of metal ions from phases containing solid metal oxides, agents and the use thereof
Inventors:
Werner Schwab, Ralf Kehl
Patented Case
View Patent ↗
Granted: Nov 9, 1993
Filed: Nov 12, 1991
Inventors
Werner Schwab
Ralf Kehl
Assignee (at issue)
Hendel Kommanditgesellschaft auf Aktien
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.