Granted Patent
Utility
US 4,339,772 · App. 06/196,491
TV Sound Transmission system
Inventors:
Carl G. Eilers, Pieter Fockens
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Oct 14, 1980
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.