Granted Patent
Utility
US 4,489,658 · App. 06/401,987
Ballast shoulder consolidator
Inventor:
Helmuth von Beckmann
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Jul 26, 1982
Inventor
Helmuth von Beckmann
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.