Granted Patent
Utility
US 6,646,837 · App. 09/682,994
Active ground current reduction device
Inventor:
Orrin B. West
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Nov 6, 2001
Inventor
Orrin B. West
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.