Granted Patent
Utility
US 6,281,809 · App. 09/523,917
Vehicle detector with audible call signal indicator
Inventor:
Thomas Potter
Patented Case
View Patent ↗
Granted: Aug 28, 2001
Filed: Mar 9, 2000
Inventor
Thomas Potter
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.