Granted Patent
Utility
US 5,909,783 · App. 08/864,276
Motorized scaffold hoisting apparatus
Inventor:
Robert P. Berish
Patented Case
View Patent ↗
Granted: Jun 8, 1999
Filed: May 28, 1997
Inventor
Robert P. Berish
Assignee (at issue)
Quality Steel Products, Inc.
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.