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Roger J. Helkey
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Goleta, CA, US
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last 30 patents
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Patent Grant
Global positioning system receiver digital processing technique
Patent number
5,293,170
Issue date
Mar 8, 1994
Ashtech Inc.
Robert G. Lorenz
G01 - MEASURING TESTING
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Patent Grant
Global positioning system receiver digital processing technique
Patent number
5,134,407
Issue date
Jul 28, 1992
Ashtech Telesis, Inc.
Robert G. Lorenz
G01 - MEASURING TESTING
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Patent Grant
Global positioning system receiver with improved radio frequency an...
Patent number
4,928,106
Issue date
May 22, 1990
Ashtech Telesis, Inc.
Javad Ashjaee
G01 - MEASURING TESTING