Granted Patent
Utility
US 4,324,189 · App. 06/130,881
Car end foldable doors locking device
Inventor:
David J. Roldness
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Mar 17, 1980
Inventor
David J. Roldness
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.