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| Number | Title | Issue Date |
| 8087480 | Device and method for feeding particles into a stream A device is provided for feeding a plurality of particles into a stream at a controlled rate, the device comprising a conduit having a flow passage for feeding the particles into the stream, and pulsating means for inducing a pulsed flow of the particles through the... | 01/03/2012 |
| 6945339 | Core drill A plurality of chip evacuating grooves (16, 26, 36, 46a, 46b) in a vertical direction in parallel with a rotational axis of a core main body (14) are formed at an outer peripheral face of the core main body (14) in a circumf... | 09/20/2005 |
| 6454028 | Wear resistant drill bit A wear resistant drill bit of the matrix bodied type has a bit body comprising a tungsten carbide material bound with a binder material, wherein the tungsten carbide material includes at least some tungsten carbide particles of generally spherical shape. ... | 09/24/2002 |
| 4042048 | Drilling technique There is disclosed a technique for drilling a well bore in which a slurry of drilling fluid and pellets is pumped through the drill pipe into a drill head. The pellets exit from the drill head and are captivated between the drill head and the bore hole. U... | 08/16/1977 |
