Granted Patent
Utility
US 4,518,997 · App. 06/457,604
Demodulator having two phase shift networks for wide band television audio
Inventor:
Orval E. Beckman
Patented Case
View Patent ↗
Granted: May 21, 1985
Filed: Jan 13, 1983
Inventor
Orval E. Beckman
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.