Granted Patent
Utility
US 6,667,122 · App. 09/921,312
Fuel cell system having a heat exchanger
Inventor:
Lars Kaufmann
Patented Case
View Patent ↗
Granted: Dec 23, 2003
Filed: Aug 3, 2001
Inventor
Lars Kaufmann
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.