Granted Patent
Utility
US 4,283,602 · App. 04/761,879
Cryptographically secure communication system
Inventors:
Robert Adams, Paul E. Ahrens, John Granlund
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Sep 23, 1968
Inventors
Robert Adams
Paul E. Ahrens
John Granlund
Assignee (at issue)
International Telephone and Telegraph 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.