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

Steven James Hart

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Design method for drillout bi-center bits

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

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Drillout bi-center bit

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

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Hybrid rotary steerable system

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2448416

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