Granted Patent
Utility
US 6,400,690 · App. 09/172,611
Dual map system for navigation and wireless communication
Inventors:
Te-Kai Liu, Michael C. Greenwood, Lawrence I. Lieberman, Kiyoshi Maruyama, Paul A. Moskowitz
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: Oct 15, 1998
Inventors
Te-Kai Liu
Michael C. Greenwood
Lawrence I. Lieberman
Kiyoshi Maruyama
Paul A. Moskowitz
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.