Granted Patent
Utility
US 4,353,068 · App. 06/152,586
Method for calibrating beam emitter type speed sensor for railroad rolling stock
Inventor:
Emilio A. Fernandez
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: May 23, 1980
Inventor
Emilio A. Fernandez
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.