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Trident probe groundwater exchange system
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Patent number 7,711,489
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Issue date May 4, 2010
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United States of America as represented by Secretary of the Navy
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David Bartholomew Chadwick
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E21 - EARTH DRILLING MINING
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Method for sampling seepage
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Patent number 7,672,795
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Issue date Mar 2, 2010
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The United States of America as represented by the Secretary of the Navy
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David B. Chadwick
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G01 - MEASURING TESTING
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Tidal seepage meter
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Patent number 7,424,375
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Issue date Sep 9, 2008
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The United States of America as represented by the Secretary of the Navy
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David B. Chadwick
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G01 - MEASURING TESTING
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Tidal seepage meter
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Patent number 6,993,437
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Issue date Jan 31, 2006
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The United States of America as represented by the Secretary of the Navy
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David B. Chadwick
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G01 - MEASURING TESTING