LandOfFree - US Patents - Listing for Boring or penetrating the earth,Bit or bit element,Bit with leading portion forming smaller diameter initial bore

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

Auger cutter head

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

Auger drilling head

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

Bi-center and bit method for enhancing stability

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

Bi-center bit adapted to drill casing shoe

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

Bi-center bit assembly

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

Bi-center bit with oppositely disposed cutting surfaces

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

Bi-centered drill bit having enhanced casing drill-out...

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

Bi-centered drill bit having improved drilling stability mud...

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

Bi-centered drill bit having improved drilling stability,...

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

Bit assembly

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

Boring head method and boring head for a ground boring device

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

Combination drilling member

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

Cutter head for rotary percussion drills

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

Cutting means for drag drill bits

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

Digging tooth

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

Down-the-hole drill tool for drilling in advance of a casing tub

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

Downhole hammer assembly

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

Drill apparatus having a primary drill and a pilot drill

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

Drill bit and system for drilling a borehole