4. Wells
  5. Submerged well
  6. Wellhead

David L. Ford

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Bit run and retrieval wear bushing and tool

Wells – Above ground apparatus – With assembly or disassembly means
Reexamination Certificate

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Bit-run nominal seat protector and method of operating same

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Drill for making flat bottom hole

Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Reexamination Certificate

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Drill for making flat bottom hole

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate

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Method for running casing while drilling system

Wells – Submerged well – Means removably connected to permanent well structure
Reexamination Certificate

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Profile ID: LFUS-PAI-P-601331

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