Granted Patent
Utility
US 4,593,230 · App. 06/362,790
Dual-mode electron gun
Inventor:
Richard B. True
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Mar 29, 1982
Inventor
Richard B. True
Assignee (at issue)
Litton Systems, Inc.
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.