Granted Patent
Utility
US 5,602,739 · App. 08/562,352
Vehicle tracking system incorporating traffic signal preemption
Inventors:
Jeffrey D. Haagenstad, Steven M. Hamer, Ronald Allen Hagen, Edmund J. Ring, Kim K. Christopher, Theodore B. Keyes
Patented Case
View Patent ↗
Granted: Feb 11, 1997
Filed: Nov 22, 1995
Inventors
Jeffrey D. Haagenstad
Steven M. Hamer
Ronald Allen Hagen
Edmund J. Ring
Kim K. Christopher
Theodore B. Keyes
Assignee (at issue)
Minnesota Mining and Manufacturing Company
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.