Granted Patent
Utility
US 4,890,074 · App. 07/308,838
Quartz microstrip gunn oscillator
Inventor:
John Ondria
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Feb 9, 1989
Inventor
John Ondria
Assignee (at issue)
Marconi Electronic Devices 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.