Granted Patent
Utility
US 5,990,621 · App. 08/891,829
Electron beam tubes including ceramic material for realizing rf chokes
Inventor:
Edward Stanislaw Sobieradzki
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jul 14, 1997
Inventor
Edward Stanislaw Sobieradzki
Assignee (at issue)
EEV Limited
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.