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Pipe joint
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Patent number 10,823,320
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Issue date Nov 3, 2020
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Northwest Pipe Company
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Brent Keil
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E21 - EARTH DRILLING MINING
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Pipe ram joint
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Patent number 10,619,778
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Issue date Apr 14, 2020
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Northwest Pipe Company
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Brent Keil
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Pipe seal and pipe joint
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Patent number 10,359,137
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Issue date Jul 23, 2019
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Northwest Pipe Company
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Brent Keil
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Breakaway post slipbase
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Patent number 6,422,783
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Issue date Jul 23, 2002
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Northwest Pipe Company
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Horace M. Jordan
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES