Granted Patent
Utility
US 4,531,020 · App. 06/401,258
Multi-layer encryption system for the broadcast of encrypted information
Inventors:
Anthony Wechselberger, Leo I. Bluestein, Leo Jedynak, David A. Drake, Larry Wayne Simpson
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Jul 23, 1982
Inventors
Anthony Wechselberger
Leo I. Bluestein
Leo Jedynak
David A. Drake
Larry Wayne Simpson
Assignee (at issue)
Oak Industries Inc.
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.