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Downhole hydraulic seismic generator
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Patent number 5,113,966
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Issue date May 19, 1992
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The United States of America as represented by the United States Department o...
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Danny L. Gregory
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G01 - MEASURING TESTING
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Rotary pneumatic valve
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Patent number 4,986,307
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Issue date Jan 22, 1991
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The United States of America as represented by the United States Department o...
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Harry C. Hardee
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Down hole periodic seismic generator
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Patent number 4,805,727
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Issue date Feb 21, 1989
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The United States of America as represented by the United States Department o...
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Harry C. Hardee
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G01 - MEASURING TESTING
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Convective heat flow probe
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Patent number 4,547,080
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Issue date Oct 15, 1985
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The United States of America as represented by the United States Department o...
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James C. Dunn
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E21 - EARTH DRILLING MINING