Granted Patent
Utility
US 4,405,944 · App. 06/357,520
TV Sound transmission system
Inventors:
Carl G. Eilers, Pieter Fockens
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Mar 12, 1982
Inventors
Carl G. Eilers
Pieter Fockens
Assignee (at issue)
Zenith Radio 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.