Granted Patent
Utility
US 4,654,705 · App. 06/567,108
Two channel audio scrambling system
Inventors:
Ronald Forbes, John A. Lund, Harold E. Mann
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Dec 30, 1983
Inventors
Ronald Forbes
John A. Lund
Harold E. Mann
Assignee (at issue)
Zenith Electronics LLC
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.