Granted Patent
Utility
US 4,236,458 · App. 05/972,858
Door locking and actuating mechanism for hopper car
Inventor:
Eugene I. Varda
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Dec 26, 1978
Inventor
Eugene I. Varda
Assignee (at issue)
The Pullman Company LLC
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.