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Field weldable connections
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Patent number 7,216,719
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Issue date May 15, 2007
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Schlumberger Technology Corporation
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Hebah Ahmed
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Redundant metal-metal seal
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Patent number 6,886,391
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Issue date May 3, 2005
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Schlumberger Technology Corporation
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Harjit S. Kohli
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E21 - EARTH DRILLING MINING
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Field weldable connections
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Patent number 6,886,638
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Issue date May 3, 2005
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Schlumbergr Technology Corporation
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Hebah Ahmed
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Redundant metal-metal seal
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Patent number 6,752,397
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Issue date Jun 22, 2004
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Schlumberger Technology Corporation
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Harjit S. Kohli
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E21 - EARTH DRILLING MINING