Granted Patent
Utility
US 6,656,616 · App. 09/820,330
Fuel cell system
Inventors:
Stefan Boneberg, Michael Schonert, Thomas Stark
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Mar 29, 2001
Inventors
Stefan Boneberg
Michael Schonert
Thomas Stark
Assignee (at issue)
BALLARD POWER SYSTEMS INC.
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.