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Wellhead completion system
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Patent number 5,327,965
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Issue date Jul 12, 1994
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ABB Vetco Gray Inc.
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Garry R. Stephen
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E21 - EARTH DRILLING MINING
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Well starter head
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Patent number 5,299,644
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Issue date Apr 5, 1994
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ABB Vetco Gray Inc.
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Lawrence A. Eckert
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E21 - EARTH DRILLING MINING
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Well starter head
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Patent number 5,205,356
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Issue date Apr 27, 1993
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ABB Vetco Gray Inc.
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Charles D. Bridges
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E21 - EARTH DRILLING MINING
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Emergency casing hanger
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Patent number 4,949,786
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Issue date Aug 21, 1990
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Vecto Gray Inc.
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Lawrence A. Eckert
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E21 - EARTH DRILLING MINING