Granted Patent
Utility
US 5,639,015 · App. 08/473,095
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Inventors:
Paul F. Petriekis, Michael Wilford
Patented Case
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Granted: Jun 17, 1997
Filed: Jun 7, 1995
Inventors
Paul F. Petriekis
Michael Wilford
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.