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| Number | Title | Issue Date |
| 6769498 | Method and apparatus for inducing under balanced drilling conditions using an injection tool attached to a concentric string of casing A method and apparatus for under balanced drilling comprising a production casing extending vertically from the ground to the area where the drilling is taking place, a concentric casing mounted within the production casing and forming therewith an outer annulus, a ... | 08/03/2004 |
| 6681872 | In situ reactor An in situ reactor for use in a geological strata, is described and which includes a liner defining a centrally disposed passageway and which is placed in a borehole formed in the geological strata; and a sampling conduit is received within the passageway... | 01/27/2004 |
| 5655610 | Auger cleaner An apparatus is provided for cleaning dirt and debris from the stem and flighting of an earth boring auger. The auger cleaner apparatus has an opposed pair of blade assemblies which are brought into mechanical engagement with the stem and flighting of the... | 08/12/1997 |
| 5224548 | Apparatus and method for retrieving lost materials in slanted boreholes A method and apparatus are disclosed for clearing debris and for retrieving lost materials from slanted boreholes. The apparatus has a central shank which is attachable to drill pipe and an auger-like helical plate wound around the shank. A cylinder with ... | 07/06/1993 |
| 5067570 | Auger and retaining shell assembly An auger assembly for drilling holes in the ground includes an auger blade mounted for vertical movement and a dirt retaining shell that surrounds the auger blade also mounted for vertical movement in relation to the auger blade. When the hole has been dr... | 11/26/1991 |
| 4790395 | Pipe-driving apparatus Pipe-driving apparatus used to create a pipe line of small diameter uses a pressing station in an access trench to drive in pipe sections one by one. A boring head and conveyor worm operates at the front of the pipe line in a working pipe section on which... | 12/13/1988 |
| 4228862 | Apparatus for drilling holes in the ground The present invention relates to an apparatus for drilling holes in the ground. The apparatus comprises a cylindrical drilling tool having one end coupled to a motor assembly for rotating the tool by way of an elongate rotatable sleeve. A hydraulic jack i... | 10/21/1980 |
| 4210215 | Rock drill with helical dust conveying groove A rock drill, especially for rotary blow machines and drifters or stoppers with drilling cutting edges and at least one drilling dust conveying groove which in axial direction is confined by a web which extends around the drill axis and one lateral surfac... | 07/01/1980 |
| 4156471 | Rubble and core removal apparatus A rubble and core removal apparatus including a casing, open at one end, with spirally extending flighting disposed therein, the flighting being secured to the inner wall of the casing and extending radially inwardly thereof in changing dimension, the cas... | 05/29/1979 |
| 3938598 | Belling apparatus The present invention relates to belling apparatus for forming a bell shaped recess at the lower end of a pier bore and is concerned primarily with such apparatus in which spoil generated by cutting the recess is continuously removed by an auger.... | 02/17/1976 |
