Granted Patent
Utility
US 5,362,836 · App. 08/073,878
Polymer electrolytes and their preparation
Inventors:
Freddy Helmer-Metzmann, Frank Osan
Patented Case
View Patent ↗
Granted: Nov 8, 1994
Filed: Jun 9, 1993
Inventors
Freddy Helmer-Metzmann
Frank Osan
Assignee (at issue)
Hoechst GmbH
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.