Granted Patent
Utility
US 4,712,239 · App. 06/874,845
Security arrangement for downloadable cable television converters
Inventors:
William A. Frezza, Robert M. Simons, Richard Westerfer
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Jun 16, 1986
Inventors
William A. Frezza
Robert M. Simons
Richard Westerfer
Assignee (at issue)
General Instrument 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.