Granted Patent
Utility
US 4,397,241 · App. 06/077,103
System for laying a separation fabric on the subgrade of a railroad bed
Inventor:
George R. Newman
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Sep 19, 1979
Inventor
George R. Newman
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.