Granted Patent
Utility
US 4,677,488 · App. 06/759,550
Video system with television receiver and teletext processor capable of switching external RGB signals
Inventor:
Thomas J. Zato
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Jul 25, 1985
Inventor
Thomas J. Zato
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.