Granted Patent
Utility
US 4,636,853 · App. 06/564,973
Dynamic audio scrambling system
Inventors:
Ronald Forbes, John A. Lund
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Dec 21, 1983
Inventors
Ronald Forbes
John A. Lund
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.