Granted Patent
Utility
US 4,397,461 · App. 06/313,602
Sorting machine
Inventors:
R. Clark DuBois, John C. Hamma
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Oct 21, 1981
Inventors
R. Clark DuBois
John C. Hamma
Assignee (at issue)
Gradco/Dendoki, 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.