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| Number | Title | Issue Date |
| 7228921 | Ice auger covering apparatus An ice auger covering apparatus includes a housing that has a bottom wall and a peripheral wall that is attached to and extends upwardly from the bottom wall. The housing has a break therein so that the housing includes a first portion and a second portion. The firs... | 06/12/2007 |
| 7201237 | Stabilizing system and methods for a drill bit A drill bit stabilizing system comprising a body member having an axis and at least one recess formed in the body member housing at least one stabilizing member when in a first retracted position. The stabilizing member is positionable along a diagonal angle with th... | 04/10/2007 |
| 7004267 | Drill bit cone protector A drill bit for use in earth-boring operations includes a threaded upper section removably connectable to a power source, and a shank section connected thereto and having a centrally disposed longitudinal axis. The shank section further has a lower portion extending... | 02/28/2006 |
| 5740872 | Hardfacing material for rolling cutter drill bits A material for applying hardfacings to the teeth of steel tooth rolling cutter drill bits comprises a mixture of refractory metal carbide, such as tungsten carbide, cobalt and metallic matrix powders formed into a core structure and surrounded by a thin m... | 04/21/1998 |
| 5279374 | Downhole drill bit cone with uninterrupted refractory coating Drill bits having projecting inserts are completely coated with refractory material including on the edge margins about the inserts by thermally spraying with refractory particles whose particulate constituent under the spraying conditions is able to pene... | 01/18/1994 |
| 4889194 | Method and a device for deep hole drilling A device for drilling deep holes in the ground has at least two axial drill bits and an equal number of plates each having three shafts axially interconnecting the plates. Two of the shafts are rigidly attached to both plates and the third shaft is pivota... | 12/26/1989 |
| 4397361 | Abradable cutter protection A rotary drill bit for drilling earth formations is disclosed having a plurality of cutting elements mounted on the head portion of the bit. The bit further includes a plurality of individual protrusions projecting from the head portion more than the exte... | 08/09/1983 |
| 3934659 | Apparatus for drilling holes in earth surface The apparatus is a rocket with a drill head provided with a group of jet nozzles. One nozzle of this group is the face-forming one, while the plurality of the rows of the rest of the nozzles belong to imaginary circles concentric with the longitudinal axi... | 01/27/1976 |
