4. Wells
  5. Packers or plugs
  6. With expanding anchor

Edward Wayne Welch, Jr.

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High pressure and temperature seal for downhole use

Seal for a joint or juncture – Seal for well apparatus – For below ground apparatus
Reexamination Certificate

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Labyrinth lock seal for hydrostatically set packer

Wells – Packers or plugs – With expanding anchor
Reexamination Certificate

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