Granted Patent
Utility
US 4,428,302 · App. 06/347,495
Emergency spring system for a railway car
Inventor:
James M. Herring, Jr.
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Feb 10, 1982
Inventor
James M. Herring, Jr.
Assignee (at issue)
The Budd Company
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.