Granted Patent
Utility
US 4,600,947 · App. 06/580,049
Television sound mute circuit
Inventors:
William Chamberlain, John C. Weigand
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Feb 14, 1984
Inventors
William Chamberlain
John C. Weigand
Assignee (at issue)
Zenith Electronics LLC
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.