4. Boring or penetrating the earth
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Protector for rock bit seals

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Providing a local response to a local condition in an oil well

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Pulsation nozzle, for self-excited oscillation of a drilling flu

Boring or penetrating the earth – Miscellaneous
Patent

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Pulse rate of penetration enhancement device and method

Boring or penetrating the earth – With tool shaft detail – Means other than tool structure to induce fluent flow
Reexamination Certificate

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Pulsed electric rock drilling apparatus

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Electrically produced heat
Reexamination Certificate

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Pump for a reverse circulation rotary drilling rig

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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Pump in core breaker carrier

Boring or penetrating the earth – Tool removable or insertable through or around driving or...
Patent

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Purging means for purging upwards in ring spacing between drill

Boring or penetrating the earth – With means movable relative to tool or shaft to control...
Patent

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