Granted Patent
Utility
US 6,789,421 · App. 10/044,088
Density-based fuel indicator system for fuel cells
Inventors:
Makarand Gore, L. Mann
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Jan 11, 2002
Inventors
Makarand Gore
L. Mann
Assignee (at issue)
Hewlett-Packard Development Company, L.P.
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.