Granted Patent
Utility
US 5,938,721 · App. 08/738,983
Position based personal digital assistant
Inventors:
William O. Dussell, James M. Janky, John F. Schipper, David J. Cowl
Patented Case
View Patent ↗
Granted: Aug 17, 1999
Filed: Oct 24, 1996
Inventors
William O. Dussell
James M. Janky
John F. Schipper
David J. Cowl
Assignee (at issue)
Trimble Navigation Limited
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.