Granted Patent
Utility
US 4,404,686 · App. 06/211,494
Four band VHF varactor tuner to cover extended CATV band utilizing two switching diodes per resonant circuit
Inventor:
Frederick H. Moon
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Dec 1, 1980
Inventor
Frederick H. Moon
Assignee (at issue)
Zenith Radio Corporation
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.