Granted Patent
Utility
US 5,091,902 · App. 07/529,686
Telecommunications transmission security arrangement
Inventors:
Geoffrey Chopping, Jonathan W. Rowe
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: May 24, 1990
Inventors
Geoffrey Chopping
Jonathan W. Rowe
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.