Granted Patent
Utility
US 5,287,409 · App. 08/015,900
Method and apparatus for frustrating vertical interval detection in scrambled television signals
Inventors:
Richard Westerfer, Henry S. Landgraf
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Feb 10, 1993
Inventors
Richard Westerfer
Henry S. Landgraf
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.