Granted Patent
Utility
US 4,598,313 · App. 06/666,852
Television signal scrambling system
Inventor:
Melvin C. Hendrickson
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Oct 31, 1984
Inventor
Melvin C. Hendrickson
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.