Granted Patent
Utility
US 5,599,639 · App. 08/549,337
Acid-modified polybenzimidazole fuel cell elements
Inventors:
Michael J. Sansone, Frank J. Onorato, Naoya Ogata
Patented Case
View Patent ↗
Granted: Feb 4, 1997
Filed: Oct 27, 1995
Inventors
Michael J. Sansone
Frank J. Onorato
Naoya Ogata
Assignee (at issue)
Hoechst Celanese Corporation
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.