Granted Patent
Utility
US 6,824,909 · App. 10/191,919
Low-humidification and durable fuel cell membrane
Inventors:
Mark Mathias, Hubert Gasteiger
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Jul 9, 2002
Inventors
Mark Mathias
Hubert Gasteiger
Assignee (at issue)
General Motors LLC
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.