Granted Patent
Utility
US 5,389,589 · App. 07/994,838
Barium-containing alumina
Inventor:
Karl Kharas
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Dec 22, 1992
Inventor
Karl Kharas
Assignee (at issue)
AlliedSignal, 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.