Granted Patent
Utility
US 6,722,489 · App. 10/368,124
Screw conveyor arm for dry material
Inventor:
Anthony J. Cook
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Feb 18, 2003
Inventor
Anthony J. Cook
Assignee (at issue)
Aluminum Ladder Company
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.