Granted Patent
Utility
US 6,519,539 · App. 09/672,040
Measurement of fuel cell impedance
Inventors:
Norman Freeman, Stephane Masse, Ravi Gopal, Pierre Rivard
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Sep 29, 2000
Inventors
Norman Freeman
Stephane Masse
Ravi Gopal
Pierre Rivard
Assignee (at issue)
HYDROGENICS CORPORATION
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.