Granted Patent
Utility
US 5,646,857 · App. 08/414,443
Use of an altitude sensor to augment availability of GPS location fixes
Inventors:
Paul W. McBurney, Paul Braisted
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Mar 31, 1995
Inventors
Paul W. McBurney
Paul Braisted
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.