Granted Patent
Utility
US 6,730,423 · App. 10/068,263
Electrical contacting device for an electrochemical fuel cell
Inventors:
Johann Einhart, Christian Cremer
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Feb 5, 2002
Inventors
Johann Einhart
Christian Cremer
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.