Douglas W. Friedrich

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Pekin, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
System and method for using parabolic models to improve position es...
- Patent number 5,629,855
- Issue date May 13, 1997
- Caterpillar Inc.
- Christos T. Kyrtsos
- B60 - VEHICLES IN GENERAL
Information Patent Grant
System and method for providing accurate vehicle positioning using...
- Patent number 5,555,503
- Issue date Sep 10, 1996
- Caterpillar Inc.
- Christos T. Kyrtsos
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Vehicle position determination system and method
- Patent number 5,438,517
- Issue date Aug 1, 1995
- Caterpillar Inc.
- James W. Sennott
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Vehicle position determination system and method
- Patent number 5,390,125
- Issue date Feb 14, 1995
- Caterpillar Inc.
- James W. Sennott
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Vehicle position determination system and method
- Patent number 5,375,059
- Issue date Dec 20, 1994
- Caterpillar Inc.
- Christos T. Kyrtsos
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method and apparatus for determining vehicle position using a satel...
- Patent number 5,359,521
- Issue date Oct 25, 1994
- Caterpillar Inc.
- Christos T. Kyrtsos
- G01 - MEASURING TESTING