Granted Patent
Utility
US 5,893,471 · App. 08/869,400
Freely-movable auxiliary hoist for a gantry crane and method for pivoting a load
Inventor:
Daniel Brian Zakula, Sr.
Patented Case
View Patent ↗
Granted: Apr 13, 1999
Filed: Jun 5, 1997
Inventor
Daniel Brian Zakula, Sr.
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.