Granted Patent
Utility
US 4,802,213 · App. 07/019,445
Sound masking in phase reversal TV scrambling system
Inventors:
Richard W. Citta, John P. Eck, Dennis M. Mutzabaugh
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Feb 26, 1987
Inventors
Richard W. Citta
John P. Eck
Dennis M. Mutzabaugh
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.