Granted Patent
Utility
US 4,577,853 · App. 06/570,923
Stacking apparatus
Inventor:
B. Michael Duke
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Jan 16, 1984
Inventor
B. Michael Duke
Assignee (at issue)
Harris Graphics
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.