Granted Patent
Utility
US 4,887,296 · App. 07/113,333
Cryptographic system for direct broadcast satellite system
Inventor:
Donald R. Horne
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Oct 16, 1987
Inventor
Donald R. Horne
Assignee (at issue)
RICOH COMPANY, LTD.
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.