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Douglas W. Friedrich

Caterpillar: 7 patents #907 of 8,398Top 15%
📍 East Peoria, IL: #46 of 393 inventorsTop 15%
🗺 Illinois: #13,022 of 84,256 inventorsTop 20%
Overall (All Time): #764,875 of 4,157,543Top 20%
7
Patents All Time

Issued Patents All Time

Showing 1–7 of 7 patents

Patent #TitleCo-InventorsDate
5629855 System and method for using parabolic models to improve position estimates from a global positioning system Christos Kyrtsos, James W. Sennott, Adam J. Gudat, Dana A. Christensen, Darrell E. Stafford 1997-05-13
5555503 System and method for providing accurate vehicle positioning using spatial bias techniques Christos Kyrtsos, Adam J. Gudat, Dana A. Christensen, Darrell E. Stafford 1996-09-10
5438517 Vehicle position determination system and method James W. Sennott, Christos Kyrtsos, Adam J. Gudat, Dana A. Christensen, Darrell E. Stafford 1995-08-01
5410325 Antenna mounting apparatus Carl A. Kemner, N. Keith Lay, Joel L. Peterson 1995-04-25
5390125 Vehicle position determination system and method James W. Sennott, Christos Kyrtsos, Adam J. Gudat, Dana A. Christensen, Darrell E. Stafford 1995-02-14
5375059 Vehicle position determination system and method Christos Kyrtsos, Adam J. Gudat, Dana A. Christensen, Darrell E. Stafford 1994-12-20
5359521 Method and apparatus for determining vehicle position using a satellite based navigation system Christos Kyrtsos, Adam J. Gudat 1994-10-25