Granted Patent
Utility
US 4,706,242 · App. 06/835,219
Digital telecommunication system
Inventor:
Geoffrey Harland
Patented Case
View Patent ↗
Granted: Nov 10, 1987
Filed: Mar 3, 1986
Inventor
Geoffrey Harland
Assignee (at issue)
STC PLC
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.