Granted Patent
Utility
US 6,668,472 · App. 10/196,570
Wedge-locking system and excavation bucket assembly with wedge-locking system
Inventor:
Robert S. Bierwith
Patented Case
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Granted: Dec 30, 2003
Filed: Jul 15, 2002
Inventor
Robert S. Bierwith
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.