Granted Patent
Utility
US 6,151,137 · App. 08/879,250
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Inventor:
Robert F. Henrick
Patented Case
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Granted: Nov 21, 2000
Filed: Jun 19, 1997
Inventor
Robert F. Henrick
Assignee (at issue)
AT&T CORP.
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.