4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Colin McHardy

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Anti blow-out control apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Downhole apparatus

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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Expanding multiple tubular portions

Wells – Expansible anchor or casing – Expansible casing
Reexamination Certificate

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Expanding multiple tubular portions

Wells – Expansible anchor or casing – Expansible casing
Reexamination Certificate

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Lock mandrel for downhole assemblies

Wells – Expansible anchor or casing – Liner hanger
Patent

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Profile ID: LFUS-PAI-P-348842

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