Granted Patent
Utility
US 4,615,028 · App. 06/577,500
Switching system with separate supervisory links
Inventors:
Conrad W. Lewis, Gino Totti
Patented Case
View Patent ↗
Granted: Sep 30, 1986
Filed: Feb 6, 1984
Inventors
Conrad W. Lewis
Gino Totti
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.