Granted Patent
Utility
US 5,331,276 · App. 07/945,474
Apparatus for passively measuring the velocity of a ferrous vehicle along a path of travel
Inventors:
Donald G. Polvani, David G. Ellerbrake
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Sep 16, 1992
Inventors
Donald G. Polvani
David G. Ellerbrake
Assignee (at issue)
Westinghouse Electric Company LLC
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.