Granted Patent
Utility
US 5,993,989 · App. 08/826,715
Interfacial material for solid oxide fuel cell
Inventors:
Li Baozhen, Roswell J. Ruka, Subhash C. Singhal
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Apr 7, 1997
Inventors
Li Baozhen
Roswell J. Ruka
Subhash C. Singhal
Assignee (at issue)
Siemens Westinghouse Power 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.