Granted Patent
Utility
US 6,646,418 · App. 10/202,594
Method and apparatus for fuel cell protection
Inventors:
Chenggang Xie, Jerald A. Hallmark
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jul 24, 2002
Inventors
Chenggang Xie
Jerald A. Hallmark
Assignee (at issue)
Motorola, 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.