Granted Patent
Utility
US 4,821,097 · App. 07/022,380
Apparatus and method for providing digital audio on the sound carrier of a standard television signal
Inventor:
Clyde Robbins
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Mar 5, 1987
Inventor
Clyde Robbins
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.