Granted Patent
Utility
US 4,282,815 · App. 06/084,307
Railroad tamping machine
Inventor:
Helmuth von Beckmann
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Oct 12, 1979
Inventor
Helmuth von Beckmann
Assignee (at issue)
Canron Corporation
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.