Granted Patent
Utility
US 5,348,934 · App. 07/756,407
Secondary emission cathode having supeconductive oxide material
Inventor:
Beverley A. Shaw
Patented Case
View Patent ↗
Granted: Sep 20, 1994
Filed: Sep 9, 1991
Inventor
Beverley A. Shaw
Assignee (at issue)
Raytheon Company
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.