Granted Patent
Utility
US 5,220,622 · App. 07/616,871
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Inventor:
Robert W. A. Scarr
Patented Case
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Granted: Jun 15, 1993
Filed: Nov 21, 1990
Inventor
Robert W. A. Scarr
Assignee (at issue)
STC PLC
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.