Granted Patent
Utility
US 4,237,928 · App. 06/042,832
Low profile tapered sump for railway tank cars
Inventor:
Robert C. Messersmith
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: May 29, 1979
Inventor
Robert C. Messersmith
Assignee (at issue)
ACF Industries Incorporated
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.