Granted Patent
Utility
US 4,241,447 · App. 04/843,689
Secure spread spectrum communication system
Inventor:
Marvin A. Epstein
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Jul 22, 1969
Inventor
Marvin A. Epstein
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.