Granted Patent
Utility
US 6,621,177 · App. 10/033,698
Public transportation signaling device
Inventor:
Sean Westcott
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Dec 26, 2001
Inventor
Sean Westcott
Assignee (at issue)
Stellar Technologies, 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.