Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Reexamination Certificate
2005-11-08
2005-11-08
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Cutting edge self-renewable during operation
C175S393000
Reexamination Certificate
active
06962217
ABSTRACT:
A long lasting rotary drill bit for drilling a hole into variable hardness geological formations that has a self-actuating mechanism responsive to the hardness of the geological formation to minimize the time necessary to drill a borehole. A long lasting rotary drill bit for drilling a hole into variable hardness geological formations that has a mechanism controllable from the surface of the earth to change the mechanical configuration of the bit to minimize the time necessary to drill a borehole. A monolithic long lasting rotary drill bit for drilling a hole into a geological formation having hardened rods composed of hard material such as tungsten carbide that are cast into a relatively soft steel matrix material to make a rotary drill bit that compensates for wear on the bottom of the drill bit and that also compensates for lateral wear of the drill bit using passive, self-actuating mechanisms, triggered by bit wear to drill relatively constant diameter holes.
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Smart Drilling and Completion, Inc.
Tsay Frank S.
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