Granted Patent
Utility
US 6,706,439 · App. 10/028,758
Pressure driven hermetically sealed pump for fuel cell system
Inventor:
Manfred Herrmann
Patented Case
View Patent ↗
Granted: Mar 16, 2004
Filed: Dec 20, 2001
Inventor
Manfred Herrmann
Assignee (at issue)
General Motors LLC
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.