Granted Patent
Utility
US 6,646,559 · App. 10/079,570
Method and apparatus for activating warning devices
Inventor:
Michael R. Smith
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Feb 22, 2002
Inventor
Michael R. Smith
Assignee (at issue)
User-Centric Enterprises, Inc.
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.