Granted Patent
Utility
US 4,548,293 · App. 06/630,751
Bin ladder construction
Inventor:
Alvin D. Haab
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Jul 13, 1984
Inventor
Alvin D. Haab
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.