Granted Patent
Utility
US 6,220,439 · App. 09/411,720
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Inventor:
Alexander Virvo
Patented Case
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Granted: Apr 24, 2001
Filed: Oct 2, 1999
Inventor
Alexander Virvo
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.