4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
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Check valve sub

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Chip sampler

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Connection device for forming a fluid supply

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Reexamination Certificate

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Continuous circulation apparatus for air drilling well bore oper

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting
Patent

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Continuous injection of an inert gas through a drill rig for dri

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Cooling and flushing means for tools used for working rock

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Reexamination Certificate

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Core and water collector

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With suction pump inlet communicating with bore bottom
Patent

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Coupling structure for a compound drill stem

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Cuttings injection system and method

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With pump
Reexamination Certificate

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