Granted Patent
Utility
US 6,020,980 · App. 08/723,750
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Inventor:
Michael B. Freeman
Patented Case
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Granted: Feb 1, 2000
Filed: Sep 30, 1996
Inventor
Michael B. Freeman
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.