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Wellbore valve
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Patent number 5,909,771
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Issue date Jun 8, 1999
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Weatherford/Lamb, Inc.
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Richard L. Giroux
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E21 - EARTH DRILLING MINING
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Valve for wellbore use
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Patent number 5,836,395
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Issue date Nov 17, 1998
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Weatherford/Lamb, Inc.
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Peter Budde
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E21 - EARTH DRILLING MINING
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Wellbore cementing system
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Patent number 5,813,457
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Issue date Sep 29, 1998
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Weatherford/Lamb, Inc.
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Richard L. Giroux
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E21 - EARTH DRILLING MINING
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Wellbore cementing system
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Patent number 5,787,979
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Issue date Aug 4, 1998
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Weatherford/Lamb, Inc.
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Richard L. Giroux
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E21 - EARTH DRILLING MINING
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Fill valve
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Patent number 5,690,177
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Issue date Nov 25, 1997
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Weatherford Lamb, Inc.
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Peter Budde
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E21 - EARTH DRILLING MINING
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Wellbore valve
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Patent number 5,680,902
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Issue date Oct 28, 1997
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Weatherford/Lamb, Inc.
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Richard L. Giroux
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E21 - EARTH DRILLING MINING
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Cementing system
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Patent number 5,553,667
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Issue date Sep 10, 1996
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Weatherford U.S., Inc.
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Peter Budde
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E21 - EARTH DRILLING MINING