LandOfFree - US Patents - Listing for Boring or penetrating the earth,With tool shaft detail,Axially telescoping shaft section

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Shock absorbing tool for connection to a drill column

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Shock isolation sub for use with downhole explosive actuated too

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Shock sub

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Shock tool for use in directional drilling

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Sub drilling sub

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

System and method for damping vibration in a drill string

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

System and method for damping vibration in a drill string

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

System and method for damping vibration in a drill string

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Telescopic bar of drill rig

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Telescopically extensible drill

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Telescoping casing joint for landing a casting string in a well

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section

Torque converter for use when drilling with a rotating drill...