4. Wells
  5. Valves, closures or changeable restrictors
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Activation mechanism for differential fill floating equipment

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Actuating ball

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Annulus pressure operated closure valve with improved power mand

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Annulus pressure operated downhole choke and associated methods

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Apparatus for cementing a casing string

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Apparatus for controlling fluid flow in a conduit wall

Wells – Valves – closures or changeable restrictors – Destructible element
Reexamination Certificate

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