Granted Patent
Utility
US 5,826,447 · App. 08/762,344
Procedure for handling materials in drums and bung-plug apparatus and method therefor
Inventor:
Michael Clark Campbell
Patented Case
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Granted: Oct 27, 1998
Filed: Dec 9, 1996
Inventor
Michael Clark Campbell
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.