Granted Patent
Utility
US 6,442,574 · App. 09/304,425
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Inventors:
Robert Schumacher, James Matthews
Patented Case
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Granted: Aug 27, 2002
Filed: Apr 29, 1999
Inventors
Robert Schumacher
James Matthews
Assignee (at issue)
AMERITECH LLC
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.