Granted Patent
Utility
US 6,823,640 · App. 10/205,176
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Inventor:
Walter W. Pytlewski
Patented Case
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Granted: Nov 30, 2004
Filed: Jul 24, 2002
Inventor
Walter W. Pytlewski
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.