4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated

Jo-Yu Chuang

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Apparatus for hard rock sidewall coring a borehole

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

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Elliptical thread design

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent

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Pilot-valve-controlled percussion drilling tool

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Shock absorbing bit retaining ring

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent

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Profile ID: LFUS-PAI-P-173479

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