Granted Patent
Utility
US 4,991,914 · App. 07/453,134
Mail sorter basket for handling mail trays
Inventor:
Melvin T. Kerstein
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Dec 12, 1989
Inventor
Melvin T. Kerstein
Assignee (at issue)
Bell and Howell, LLC
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.