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Tong for wellbore operations
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Patent number 7,028,787
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Issue date Apr 18, 2006
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Weatherford/Lamb, Inc.
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John Timothy Allen
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E21 - EARTH DRILLING MINING
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Tong for wellbore operations
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Patent number 6,668,684
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Issue date Dec 30, 2003
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Weatherford/Lamb, Inc.
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John Timothy Allen
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E21 - EARTH DRILLING MINING
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Wellbore circulation system
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Patent number 6,412,554
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Issue date Jul 2, 2002
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Weatherford/Lamb, Inc.
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John Timothy Allen
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E21 - EARTH DRILLING MINING
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Tong
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Patent number 6,330,911
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Issue date Dec 18, 2001
-
Weatherford/Lamb, Inc.
-
John Timothy Allen
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E21 - EARTH DRILLING MINING