Granted Patent
Utility
US 4,690,071 · App. 06/828,552
Truss end structure for stub sill hopper cars
Inventors:
Robert Billingsley, Steven L. Jantzen
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Jan 29, 1986
Inventors
Robert Billingsley
Steven L. Jantzen
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.