Low friction subterranean drill bit and related methods
Patent 5131478 Issued on July 21, 1992. Estimated Expiration Date: 
July 10, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 10, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1463566 3163243 3629558 3751177 3851719 Rotating cutter tool Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head Drilling device Rotary drill bit Cutter mounting for drag bits InventorsApplicationNo. 550785 filed on 07/10/1990US Classes:175/57, PROCESSES175/399, With bore wall engaging guide175/408, With bit guide or bore wall compacting device175/431Having a particular orientation or locationExaminersPrimary: Dang, Hoang C.Attorney, Agent or FirmInternational ClassesE21B 007/10E21B 010/00 E21B 010/46 AbstractA subterranean drill bit operable with a rotational drive source is provided for drilling in subterranean earthen materials to create a borehole having a borehole wall. The drill bit comprises a drill bit body having a base portion, a gauge portion and a face portion disposed about a bit axis. A plurality of diamond cutting elements are fixedly disposed on and project from the face portion and are spaced from one another. The cutting elements are disposed for causing a net radial imbalance force during the drilling along a net radial imbalance force vector substantially perpendicular to the bit axis. A substantially continuous cutter devoid region is disposed on the gauge portion about the force point, and a bearing support is disposed in the cutter devoid region about the force point for substantially continuously contacting the borehole wall during the drilling. The cutting elements are positioned to cause the net radial imbalance force to substantially maintain the bearing support in contact with the borehole wall during the drilling, to cause the net radial imbalance force vector to have an equilibrium direction, and to cause the net radial imbalance force vector to return substantially to the equilibrium direction in response to a disturbing displacement.Other References
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