Granted Patent
Utility
US 4,484,527 · App. 06/401,190
Convertible railway hopper car
Inventor:
James C. O'Hara
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Jul 23, 1982
Inventor
James C. O'Hara
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.