Granted Patent
Utility
US 4,500,087 · App. 06/458,581
Drop tray sorter
Inventor:
R. Clark DuBois
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: Jan 17, 1983
Inventor
R. Clark DuBois
Assignee (at issue)
Gradco Systems, 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.