Granted Patent
Utility
US 6,764,261 · App. 10/295,007
Locking device and method for catch basin and manhole covers, and the like
Inventor:
David Stadler
Patented Case
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Granted: Jul 20, 2004
Filed: Nov 13, 2002
Inventor
David Stadler
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.