Granted Patent
Utility
US 6,821,664 · App. 10/247,990
Method and apparatus for a combined fuel cell and hydrogen purification system
Inventors:
John Parks, Glen Benson, Wieslaw J. Zielinski, Arne Ballantine, Richard L. Chartrand
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Sep 20, 2002
Inventors
John Parks
Glen Benson
Wieslaw J. Zielinski
Arne Ballantine
Richard L. Chartrand
Assignee (at issue)
Plug Power 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.