Granted Patent
Utility
US 6,389,619 · App. 09/496,592
Invalid lifting device
Inventor:
Robert J. Dunn
Patented Case
View Patent ↗
Granted: May 21, 2002
Filed: Feb 2, 2000
Inventor
Robert J. Dunn
Assignee (at issue)
Arjo Limited
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.