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Downhole impact apparatus
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Patent number 11,028,660
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Issue date Jun 8, 2021
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Impact Selector International, LLC
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James Patrick Massey
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E21 - EARTH DRILLING MINING
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Downhole impact apparatus
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Patent number 10,731,431
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Issue date Aug 4, 2020
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Impact Selector International, LLC
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James P. Massey
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E21 - EARTH DRILLING MINING
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Downhole disconnect tool
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Patent number 10,669,799
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Issue date Jun 2, 2020
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Impact Selector International, LLC
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James P. Massey
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E21 - EARTH DRILLING MINING
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Back-off tool
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Patent number 4,537,255
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Issue date Aug 27, 1985
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Jet Research Center, Inc.
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John A. Regalbuto
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E21 - EARTH DRILLING MINING
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Well drilling tool
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Patent number 4,431,053
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Issue date Feb 14, 1984
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Texaco Inc.
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Timothy N. Morrow
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E21 - EARTH DRILLING MINING
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Pipe joint separation
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Patent number 4,396,065
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Issue date Aug 2, 1983
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Phillips Petroleum Company
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John R. McKenney
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E21 - EARTH DRILLING MINING
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Well tubing drain
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Patent number 3,981,360
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Issue date Sep 21, 1976
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Cook Testing Co.
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Anil Marathe
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E21 - EARTH DRILLING MINING
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3713484
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Patent number 3,713,484
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Issue date Jan 30, 1973
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E21 - EARTH DRILLING MINING
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3491830
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Patent number 3,491,830
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Issue date Jan 27, 1970
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E21 - EARTH DRILLING MINING
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3404563
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Patent number 3,404,563
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Issue date Oct 8, 1968
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E21 - EARTH DRILLING MINING
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3227214
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Patent number 3,227,214
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Issue date Jan 4, 1966
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E21 - EARTH DRILLING MINING
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3211222
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Patent number 3,211,222
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Issue date Oct 12, 1965
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E21 - EARTH DRILLING MINING
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3199594
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Patent number 3,199,594
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Issue date Aug 10, 1965
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E21 - EARTH DRILLING MINING
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3157119
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Patent number 3,157,119
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Issue date Nov 17, 1964
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E21 - EARTH DRILLING MINING
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2911909
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Patent number 2,911,909
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Issue date Nov 10, 1959
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E21 - EARTH DRILLING MINING
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2909227
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Patent number 2,909,227
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Issue date Oct 20, 1959
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E21 - EARTH DRILLING MINING
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2905437
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Patent number 2,905,437
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Issue date Sep 22, 1959
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E21 - EARTH DRILLING MINING
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2884065
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Patent number 2,884,065
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Issue date Apr 28, 1959
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E21 - EARTH DRILLING MINING