Granted Patent
Utility
US 4,685,102 · App. 06/609,443
Switching system loopback test circuit
Inventor:
Conrad W. Lewis
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: May 11, 1984
Inventor
Conrad W. Lewis
Assignee (at issue)
Mitel 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.