Granted Patent
Utility
US 6,502,267 · App. 09/858,966
Conveyor crossover
Inventors:
Ellie H. MacDonald, David A. Perry
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: May 16, 2001
Inventors
Ellie H. MacDonald
David A. Perry
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.