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Well safety system method
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Patent number 4,319,639
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Issue date Mar 16, 1982
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Plug catcher tool
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Patent number 4,260,021
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Issue date Apr 7, 1981
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Drilling tool
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Patent number 4,074,761
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Issue date Feb 21, 1978
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Retrievable safety valve
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Patent number 4,071,088
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Issue date Jan 31, 1978
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Subsurface well apparatus
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Patent number 4,036,296
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Issue date Jul 19, 1977
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Well tool
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Patent number 3,987,849
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Issue date Oct 26, 1976
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Safety valve
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Patent number 3,941,348
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Issue date Mar 2, 1976
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING
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Drilling tool
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Patent number 3,938,589
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Issue date Feb 17, 1976
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Hydril Company
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James D. Mott
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E21 - EARTH DRILLING MINING