Granted Patent
Utility
US 6,309,772 · App. 09/274,018
Membrane-electrode unit for polymer electrolyte fuel cells and processes for their preparation
Inventors:
Ralf Zuber, Knut Fehl, Karl-Anton Starz, Udo Stenke
Patented Case
View Patent ↗
Granted: Oct 30, 2001
Filed: Mar 22, 1999
Inventors
Ralf Zuber
Knut Fehl
Karl-Anton Starz
Udo Stenke
Assignee (at issue)
Degussa AG
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.