Granted Patent
Utility
US 5,139,421 · App. 07/390,963
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Inventor:
Gregory Rudolph Verderber
Patented Case
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Granted: Aug 18, 1992
Filed: Aug 8, 1989
Inventor
Gregory Rudolph Verderber
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.