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Harold J. Engebretson
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Longbranch, WA, US
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Patents Grants
last 30 patents
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Patent Grant
Method for computation of differential azimuth from spaced-apart gr...
Patent number
7,028,409
Issue date
Apr 18, 2006
Scientific Drilling International
Harold J. Engebretson
G01 - MEASURING TESTING
Information
Patent Grant
Borehole surveying employing ring laser gyroscope
Patent number
4,594,790
Issue date
Jun 17, 1986
Applied Technologies Associates
Harold J. Engebretson
E21 - EARTH DRILLING MINING
Information
Patent Grant
Apparatus and method to communicate bidirectional information in a...
Patent number
4,593,559
Issue date
Jun 10, 1986
Applied Technologies Associates
David C. Brown
E21 - EARTH DRILLING MINING
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Patent Grant
Azimuth determination for vector sensor tools
Patent number
4,559,713
Issue date
Dec 24, 1985
Applied Technologies Associates
Paul W. Ott
E21 - EARTH DRILLING MINING
Information
Patent Grant
Azimuth determination for vector sensor tools
Patent number
4,433,491
Issue date
Feb 28, 1984
Applied Technologies Associates
Paul W. Ott
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
Method for computation of differential azimuth from spaced-apart gr...
Publication number
20050240350
Publication date
Oct 27, 2005
Harold J. Engebretson
G01 - MEASURING TESTING