Granted Patent
Utility
US 5,239,272 · App. 07/664,567
Electron beam tube arrangements having primary and secondary output cavities
Inventors:
Heinz Bohlen, David Mark Wilcox, Roy Heppinstall, Mark E. Bridges, Steven Bardell
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Mar 6, 1991
Inventors
Heinz Bohlen
David Mark Wilcox
Roy Heppinstall
Mark E. Bridges
Steven Bardell
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.