Granted Patent
Utility
US 6,797,421 · App. 10/043,791
Method and apparatus for preventing water in fuel cell power plants from freezing during storage
Inventors:
Richard J. Assarabowski, William T. Unkert, Leonard A. Bach, Albert P. Grasso, Benoit Olsommer
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Jan 11, 2002
Inventors
Richard J. Assarabowski
William T. Unkert
Leonard A. Bach
Albert P. Grasso
Benoit Olsommer
Assignee (at issue)
UTC Fuel Cells, 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.