Granted Patent
Utility
US 4,797,672 · App. 06/904,085
Voice network security system
Inventor:
Paavo T. Kousa
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Sep 4, 1986
Inventor
Paavo T. Kousa
Assignee (at issue)
Octel Communications 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.