Granted Patent
Utility
US 6,342,854 · App. 09/506,014
Position determining system
Inventors:
Peter James Duffett-Smith, Keith James Bruno Grainge
Patented Case
View Patent ↗
Granted: Jan 29, 2002
Filed: Feb 17, 2000
Inventors
Peter James Duffett-Smith
Keith James Bruno Grainge
Assignee (at issue)
Cambridge Positioning Systems 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.