Granted Patent
Utility
US 4,920,733 · App. 07/417,506
Self-propelled, walk-behind, hydraulic motor-operated mower
Inventor:
Joseph E. Berrios
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Oct 5, 1989
Inventor
Joseph E. Berrios
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.