Granted Patent
Utility
US 4,956,862 · App. 07/305,785
Method of providing sound privacy system compatible with mono and btsc stereo audio
Inventors:
Clyde Robbins, John Schilling
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Feb 2, 1989
Inventors
Clyde Robbins
John Schilling
Assignee (at issue)
General Instrument 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.