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Hydraulic fluid coupling
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Patent number 7,225,888
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Issue date Jun 5, 2007
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Scientific Drilling International
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Donald H. Van Steenwyk
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E21 - EARTH DRILLING MINING
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Casing joint detector
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Patent number 5,720,345
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Issue date Feb 24, 1998
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Applied Technologies Associates, Inc.
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Timothy M. Price
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E21 - EARTH DRILLING MINING
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Wireline wet connection
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Patent number 5,389,003
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Issue date Feb 14, 1995
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Scientific Drilling International
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Donald H. Van Steenwyk
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E21 - EARTH DRILLING MINING
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High speed well surveying
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Patent number 4,611,405
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Issue date Sep 16, 1986
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Applied Technologies Associates
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Donald H. Van Steenwyk
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E21 - EARTH DRILLING MINING