Granted Patent
Utility
US 6,633,813 · App. 09/786,491
Navigation system for supplementary representation of directional information
Inventor:
Frank Deworetzki
Patented Case
View Patent ↗
Granted: Oct 14, 2003
Filed: Apr 20, 2001
Inventor
Frank Deworetzki
Assignee (at issue)
Mannesmann VDO AG
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.