Granted Patent
Utility
US 6,573,682 · App. 10/017,461
Fuel cell system multiple stage voltage control method and apparatus
Inventor:
Martin Pearson
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Dec 14, 2001
Inventor
Martin Pearson
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.