Granted Patent
Utility
US 4,400,630 · App. 06/214,026
Frequency multipliers
Inventor:
David P. Owen
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Dec 8, 1980
Inventor
David P. Owen
Assignee (at issue)
Marconi Instruments 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.