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Fail-safe blowout preventer
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Patent number 4,877,217
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Issue date Oct 31, 1989
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Bowen Tools, Inc.
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Archie W. Peil
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E21 - EARTH DRILLING MINING
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Casing scraper
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Patent number 4,648,447
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Issue date Mar 10, 1987
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Bowen Tools, Inc.
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Thomas R. Bishop
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E21 - EARTH DRILLING MINING
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Shock absorber assembly
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Patent number 4,439,167
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Issue date Mar 27, 1984
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Bowen Tools, Inc.
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Thomas R. Bishop
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E21 - EARTH DRILLING MINING
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Seal assembly
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Patent number 4,027,816
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Issue date Jun 7, 1977
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Bowen Tools, Inc.
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Damon T. Slator
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Hydraulic well jar
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Patent number 3,955,634
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Issue date May 11, 1976
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Bowen Tools, Inc.
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Damon T. Slator
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E21 - EARTH DRILLING MINING