Granted Patent
Utility
US 6,166,774 · App. 09/025,362
Combining NTSC visual and aural signals with DTV signals
Inventor:
Robert J. Plonka
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Feb 18, 1998
Inventor
Robert J. Plonka
Assignee (at issue)
HARRIS 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.