Granted Patent
Utility
US 4,244,299 · App. 05/905,067
Railway side door hopper car locking mechanism
Inventor:
William H. Peterson
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: May 11, 1978
Inventor
William H. Peterson
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.