Granted Patent
Utility
US 6,156,449 · App. 09/376,438
Catalyst layer for polymer electrolyte fuel cells
Inventors:
Ralf Zuber, Ralf Karch, Knut Fehl, Karl-Anton Starz
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Aug 18, 1999
Inventors
Ralf Zuber
Ralf Karch
Knut Fehl
Karl-Anton Starz
Assignee (at issue)
Degussa-Huels 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.