4. Boring or penetrating the earth
  5. Bit or bit element
  6. Bit with leading portion forming smaller diameter initial bore

Rogerio H. Silva

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Bi-center bit adapted to drill casing shoe

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate

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Bi-center bit adapted to drill casing shoe

Metal tools and implements – making – Blank or process – Drill
Reexamination Certificate

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Expandable eccentric reamer and method of use in drilling

Boring or penetrating the earth – Processes
Reexamination Certificate

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Sub-reamer for bi-center type tools

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2438769

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