4. Ships
  5. Building
  6. Freighters

William M. Roberts

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Apparatus for selective disengagement of a fluid transmission co

Wells – Packers or plugs – With detachable setting means
Patent

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Ball seat sub

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Downhole packer system

Wells – Packers or plugs – With expanding anchor
Patent

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Drillable bridge plug

Wells – Packers or plugs – With expanding anchor
Reexamination Certificate

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Drillable bridge plug

Wells – Packers or plugs – With expanding anchor
Reexamination Certificate

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Profile ID: LFUS-PAI-P-456513

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