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Patent applications and USPTO patent grants for Engebretson; Harold J..The latest application filed is for "method for computation of differential azimuth from spaced-apart gravity component measurements".
Patent | Date |
---|---|
Method for computation of differential azimuth from spaced-apart gravity component measurements Grant 7,028,409 - Engebretson , et al. April 18, 2 | 2006-04-18 |
Method for computation of differential azimuth from spaced-apart gravity component measurements App 20050240350 - Engebretson, Harold J. ;   et al. | 2005-10-27 |
Calibration correction method for magnetic survey tools Grant 5,321,893 - Engebretson June 21, 1 | 1994-06-21 |
Borehole surveying employing ring laser gyroscope Grant 4,594,790 - Engebretson June 17, 1 | 1986-06-17 |
Azimuth determination for vector sensor tools Grant 4,559,713 - Ott , et al. December 24, 1 | 1985-12-24 |
Borehole azimuth determination using magnetic field sensor Grant 4,472,884 - Engebretson September 25, 1 | 1984-09-25 |
Azimuth determination for vector sensor tools Grant 4,433,491 - Ott , et al. February 28, 1 | 1984-02-28 |
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