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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7748477 | Boring system and method therefor A boring system and method for same, relating to the boring system and method therefor, in particular to the boring system and method therefor for forming boring holes on the ground, which includes a bit unit for boring the ground, a connecting rod connected with a ... | 07/06/2010 |
| 7056065 | Device and method for changing lines A device for replacing lines without excavation including an annular overdrilling head and a drive for rotating a front module arranged on the drilling head. ... | 06/06/2006 |
| 6957930 | Apparatus to form columns of granular material Apparatus to install small diameter columns of granular material in soil which includes rotating hollow shaft mandrel with external projections to aid mandrel advance into the soil and define the size of the cavity formed in the soil, the cavity being filled with gr... | 10/25/2005 |
| 6892834 | Piloted drill barrel and method of using same A hard rock drill barrel has a barrel portion with a downhole hammer drill disposed therein at the barrel's periphery. A pilot portion, in substantial axial alignment with the barrel but having a smaller diameter, extends distally from the barrel for inserting into ... | 05/17/2005 |
| 6732816 | Method of forming a trenchless flowline The present invention is an improved method of installing a flowline below the surface. The method includes the steps of establishing first and second sight relief holes along a linear path, positioning a directional drilling machine on the surface, boring a first p... | 05/11/2004 |
| 6439322 | Downhole hammer-type core barrel and method of using same A core barrel has a plurality of pneumatic downhole hammer drills disposed around the perimeter of its working end for drilling piles in the ground for use in foundations, secant piles, and the like. The core barrel includes a slurry port and an air port ... | 08/27/2002 |
| 6422328 | Dual cutting mill A rotating tool for milling or drilling in a well bore, having one or more rotating cutting structures, with each cutting structure rotating about its own axis, and with the cutting structures rotating about the axis of the tool. The rotational axis of th... | 07/23/2002 |
| 6189630 | Downhole hammer-type core barrel A core barrel has a plurality of pneumatic downhole hammer drills disposed around the perimeter of its working end for drilling piles in the ground for use in foundations, secant piles, and the like. The core barrel includes a slurry port and an air port ... | 02/20/2001 |
| 6082471 | Horizontal boring apparatus used to install a pipeline A boring head is provided for use in mounting to a drill pipe of a drilling rig for enlarging a pilot bore in horizontal boring operations. The boring head has an axial member positioned along a central axis of the boring head for connecting the boring he... | 07/04/2000 |
| 5979573 | Horizontal boring apparatus A boring head is provided for use in mounting to a drill pipe of a drilling rig for enlarging a pilot bore in horizontal boring operations. The boring head has an axial member positioned along a central axis of the boring head for connecting the boring he... | 11/09/1999 |
| 5797465 | Multi-shaft drilling unit At least one guide shaft is equipped on one or both sides of a plurality of drilling shafts arranged on a line; and a jet nozzle is equipped with said guide shaft. A multi-shaft drilling unit, equipped with preferably three auger shafts, is used to develo... | 08/25/1998 |
| 5575345 | Multi shaft drilling unit A multi-shaft drilling unit having three auger shafts for developing a continuous under ground wall and comprises a housing for retaining pitch between the auger shafts, the housing comprising, primary transfer gears rotating around a central auger shaft,... | 11/19/1996 |
| 5358060 | Successive hole boring machine and lost strike preventing device for successive hole boring machine A plurality of rods each having a bit at a front end are disposed in parallel to one another so that adjacent bits are displaced to some extent forward and backward, and a striking device operatively connected to each of the rods includes a striking block... | 10/25/1994 |
| 5111801 | Apparatus for forming slit in rock and concrete surface An apparatus for forming a slit in a rock and a concrete surface has a simple construction to enable a deep slit having a predetermined width and smooth inner surface to be made efficiently and also decreases the slit making cost due to replacement of bit... | 05/12/1992 |
| 4444278 | Rotatable drilling head A drilling head for use in mining operations comprises a cylindrical drum having an open rear end and defining an interior cavity, an exterior spiral arranged to forwardly advance mined particles, a nose spiral disposed in advance of the drum and arranged... | 04/24/1984 |
| 4402371 | Rotatable drilling head A drilling head for use in mining operations comprises a cylindrical drum having an open rear end and defining an interior cavity, an exterior spiral arranged to forwardly advance mined particles, a nose spiral disposed in advance of the drum and arranged... | 09/06/1983 |
| 4134462 | Geothermal energy recovery Apparatus and method for recovering resources from subterranean rock formations, particularly heat energy, and more particularly geothermal energy. A heat-drill, which has means associated therewith for removing some rock from the earth and forming other ... | 01/16/1979 |
| 4121668 | Motor-driven cultivator with counter-rotating auger shafts This cultivator includes a base, which is carried by a pair of ground wheels, and a motor mounted to the base above a pair of auger assemblies. The motor shaft extends rearwardly of the base and the auger assemblies include elongate shafts rotatively moun... | 10/24/1978 |
| 4013319 | Tunneling machine with massive guide for impact tools A tunneling machine is described which uses an array of impact tools for cutting a deep kerf that defines the wall of the tunnel. The impact tool provides impact blows through drill steels to which drill bits are attached. A substantial portion of the dri... | 03/22/1977 |
| 3991817 | Geothermal energy recovery Apparatus and method for recovering resources from subterranean rock formations, particularly heat energy, and more particularly geothermal energy. A heat-drill, which has means associated therewith for removing some rock from the earth and forming other ... | 11/16/1976 |
