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Static wellhead plug
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Patent number 5,996,697
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Issue date Dec 7, 1999
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Halliburton Energy Services, Inc.
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James D. Vick
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E21 - EARTH DRILLING MINING
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Streamlined flapper valve
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Patent number 5,323,859
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Issue date Jun 28, 1994
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Halliburton Company
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Roddie R. Smith
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E21 - EARTH DRILLING MINING
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Perforating type lockout tool
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Patent number 5,249,630
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Issue date Oct 5, 1993
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Otis Engineering Corporation
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Michael W. Meaders
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E21 - EARTH DRILLING MINING
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Streamlined flapper valve
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Patent number 5,137,089
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Issue date Aug 11, 1992
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Otis Engineering Corporation
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Roddie R. Smith
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E21 - EARTH DRILLING MINING
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Valve
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Patent number 5,050,839
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Issue date Sep 24, 1991
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Otis Engineering Corporation
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Rennie L. Dickson
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E21 - EARTH DRILLING MINING
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