Granted Patent
Utility
US 5,572,092 · App. 08/069,705
High frequency vacuum tube with closely spaced cathode and non-emissive grid
Inventor:
Merrald B. Shrader
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: Jun 1, 1993
Inventor
Merrald B. Shrader
Assignee (at issue)
Communications & Power Industries LLC
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.