Granted Patent
Utility
US 4,972,405 · App. 07/364,256
Data path protection
Inventor:
Stephen P. Ferguson
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jun 9, 1989
Inventor
Stephen P. Ferguson
Assignee (at issue)
GEC Plessey Telecommunication Limited
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.