Granted Patent
Utility
US 6,597,987 · App. 09/855,381
Method for improving vehicle positioning in a navigation system
Inventor:
Mark Barton
Patented Case
View Patent ↗
Granted: Jul 22, 2003
Filed: May 15, 2001
Inventor
Mark Barton
Assignee (at issue)
Navigation Technologies Corp.
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.