Granted Patent
Utility
US 5,479,473 · App. 08/084,974
Method and apparatus for testing call paths over long distance carrier networks
Inventor:
David A. Zey
Patented Case
View Patent ↗
Granted: Dec 26, 1995
Filed: Jun 25, 1993
Inventor
David A. Zey
Assignee (at issue)
MCI Communications 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.