Granted Patent
Utility
US 4,247,804 · App. 06/045,460
Cold cathode discharge device with grid control
Inventor:
Robin J. Harvey
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jun 4, 1979
Inventor
Robin J. Harvey
Assignee (at issue)
Hughes Aircraft Company
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.