Granted Patent
Utility
US 4,266,351 · App. 06/083,947
Center plow for railroad ballast
Inventor:
Emmett W. Cox
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Oct 11, 1979
Inventor
Emmett W. Cox
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.