Granted Patent
Utility
US 4,420,434 · App. 06/223,640
Perfluoralkyl anion/perfluoroalkyl cation ion pair complexes
Inventor:
Robert A. Falk
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Jan 9, 1981
Inventor
Robert A. Falk
Assignee (at issue)
Ciba-Geigy
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.