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Stripper/packer
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Patent number 6,484,808
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Issue date Nov 26, 2002
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Varco I/P, Inc.
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Donald L. Jones
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E21 - EARTH DRILLING MINING
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Valve assembly
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Patent number 6,334,487
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Issue date Jan 1, 2002
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Courtney W. Adkins
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E21 - EARTH DRILLING MINING
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Wellbore mill system
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Patent number 6,116,336
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Issue date Sep 12, 2000
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Weatherford/Lamb, Inc.
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Courtney W. Adkins
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E21 - EARTH DRILLING MINING
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Wellbore milling system
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Patent number 5,743,331
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Issue date Apr 28, 1998
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Weatherford/Lamb, Inc.
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Courtney W. Adkins
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E21 - EARTH DRILLING MINING