Granted Patent
Utility
US 5,806,809 · App. 08/816,167
Railroad switch point position sensing system and method
Inventor:
Don D. Danner
Patented Case
View Patent ↗
Granted: Sep 15, 1998
Filed: Mar 12, 1997
Inventor
Don D. Danner
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.