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Mark K. Crutchfield
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Kingwood, TX, US
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last 30 patents
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Patent Grant
Ram blowout preventer apparatus
Patent number
4,647,002
Issue date
Mar 3, 1987
Hydril Company
Mark K. Crutchfield
E21 - EARTH DRILLING MINING
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Patent Grant
Ram blowout preventer securing and retracting apparatus
Patent number
4,504,037
Issue date
Mar 12, 1985
Hydril Company
Clark W. Beam
E21 - EARTH DRILLING MINING