Granted Patent
Utility
US 6,580,997 · App. 09/964,925
Hierarchical traffic control system which includes vehicle roles and permissions
Inventors:
Margaret Gardner MacPhail, David Bruce Kumhyr
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Sep 27, 2001
Inventors
Margaret Gardner MacPhail
David Bruce Kumhyr
Assignee (at issue)
International Business Machines Corporation
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.