Granted Patent
Utility
US 6,574,549 · App. 09/802,703
Method and system for the visually impaired to navigate a route through a facility
Inventors:
Robert Thomas Cato, Kerry A. Ortega, Thomas J. Sluchak
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Mar 9, 2001
Inventors
Robert Thomas Cato
Kerry A. Ortega
Thomas J. Sluchak
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.