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Stephen G. Southland
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Houston, TX, US
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last 30 patents
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Patent Grant
Diamond cutting element
Patent number
4,852,671
Issue date
Aug 1, 1989
Diamant Boart-Stratabit (USA) Inc.
Stephen G. Southland
E21 - EARTH DRILLING MINING
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Patent Grant
Orientable fluid nozzle for drill bits
Patent number
4,794,995
Issue date
Jan 3, 1989
Diamant Boart-Statabit (USA) Inc.
Lawrence W. Matson
E21 - EARTH DRILLING MINING