Granted Patent
Utility
US 4,419,851 · App. 06/286,163
Stair structure for storage bins
Inventor:
Joseph A. Kruger
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Jul 23, 1981
Inventor
Joseph A. Kruger
Assignee (at issue)
Brock Manufacturing, 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.