Granted Patent
Utility
US 5,209,001 · App. 07/869,349
Trenching machine with longitudinally stabilized main frame for stabilizing digging implement
Inventor:
Jerry F. Gilbert
Patented Case
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Granted: May 11, 1993
Filed: Apr 14, 1992
Inventor
Jerry F. Gilbert
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.