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Testing drill packer
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Patent number 6,918,440
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Issue date Jul 19, 2005
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Halliburton Energy Services, Inc.
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Virgilio Garcia-Soule
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E21 - EARTH DRILLING MINING
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Pressure activated switch valve
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Patent number 6,035,880
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Issue date Mar 14, 2000
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Halliburton Energy Services, Inc.
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Two-way plugs for wells
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Patent number 4,928,761
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Issue date May 29, 1990
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Parking mandrel
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Patent number 4,844,160
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Issue date Jul 4, 1989
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Locking device for well tools
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Patent number 4,540,048
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Issue date Sep 10, 1985
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Running tool
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Patent number 4,181,344
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Issue date Jan 1, 1980
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Well testing tool system
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Patent number 4,149,593
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Issue date Apr 17, 1979
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Well system
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Patent number 4,043,392
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Issue date Aug 23, 1977
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING
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Soft set running tool
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Patent number 4,035,011
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Issue date Jul 12, 1977
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Otis Engineering Corporation
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Imre I. Gazda
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E21 - EARTH DRILLING MINING