Granted Patent
Utility
US 4,470,071 · App. 06/412,902
Television sound detection system using a frequency translation phase-locked loop
Inventor:
Abraham E. Rindal
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Aug 30, 1982
Inventor
Abraham E. Rindal
Assignee (at issue)
RCA 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.