Granted Patent
Utility
US 4,487,133 · App. 06/425,034
Primary suspension system for providing low vertical and longitudinal spring rates in a railway cap
Inventor:
Walter S. Eggert, Jr.
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Sep 24, 1982
Inventor
Walter S. Eggert, 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.