4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Cutter element shifted by fluid pressure

Fausto Pietrobelli

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Packing device for oil wells

Wells – Packers or plugs – With expanding anchor
Reexamination Certificate

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Section mill for wells

Wells – Means for perforating – weakening – bending or separating pipe... – Cutter rotates circumferentially of pipe
Reexamination Certificate

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Underreamer

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Underreamer with turbulence cleaning mechanism

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Profile ID: LFUS-PAI-P-898404

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