Granted Patent
Utility
US 4,167,690 · App. 05/792,569
Cathode and method of operating the same
Inventor:
Robert A. Gange
Patented Case
View Patent ↗
Granted: Sep 11, 1979
Filed: May 2, 1977
Inventor
Robert A. Gange
Assignee (at issue)
RCA 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.