Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7886851 | Drill bit nozzle A drill bit comprising a body intermediate a threaded shank and a working face with the working face comprising a plurality of blades converging towards a center of the working face and diverging towards a gauge of the working face. Junk slots comprising a base are ... | 02/15/2011 |
| 7281594 | Rock drill bit The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body, a head portion defining a longitudinal center axis. The head portion includes an axially forward rock-crushing surface and a skirt that extends axially rea... | 10/16/2007 |
| 7278499 | Rotary drag bit including a central region having a plurality of cutting structures A rotary drag bit including an inverted cone geometry proximate the longitudinal axis thereof is disclosed. The inverted cone region may include a central region, the central region including a plurality of cutting structures affixed thereto and arranged along at le... | 10/09/2007 |
| 7258179 | Rotary bit with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 08/21/2007 |
| 7252155 | Percussive power tool with flushing head A power tool (1) having a striking means (5), by which a percussive tool (2) that can be driven at least partially along an axis (A) struck directly and having a flushing bore (4) extending at least partially longitudinally through a tool... | 08/07/2007 |
| 7137462 | Drill bit A drill bit constructed to improve a tip end of the cutting pointed portion to efficiently discharge chips from a center portion of a crush face of a drill hole to thereby improve cutting efficiency, is disclosed. A plurality of cutting blades 3a, 3... | 11/21/2006 |
| 7104344 | Percussion drilling head Device and method for drilling into geological formations. The device comprises: a rotatable body; drilling cutters arranged on an axial end surface of the rotatable body; a percussion part, which ... | 09/12/2006 |
| 7093671 | Pneumatic rock-boring device and method for starting such a device The invention relates to a method for horizontal ground-boring, in particular for rock-boring, by a rotating and hammering driven ground-boring device, whereby the device is alternately or simultaneously supplied with compressed air and drilling medium and the compr... | 08/22/2006 |
| 6918455 | Drill bit with large inserts A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystallin... | 07/19/2005 |
| 6834733 | Spiral wave bladed drag bit A drag-type drill bit for bore hole drilling in earth formation comprises a bit body having a threaded pin on one end for coupling to a drill string. A substantially dome-shaped cutter head is formed integral with the bit body opposite from the threaded pin. Formed ... | 12/28/2004 |
| 6250857 | Drill A drill having a drill head with a drill shank extending between the drill head and a plug-in end lying opposite the drill head, said drill shank having a conveying helix formed by at least two helical flutes and webs located between the flutes. The flute... | 06/26/2001 |
| 6209660 | Drill bit shear relief for horizontal directional drilling of rock formations A drill bit for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubrica... | 04/03/2001 |
| 6125950 | Collared boring bit A collared boring bit which interfaces with a boring head whereby shear forces developed during a boring operation are transmitted through the collar to the boring head, with minimal shear force being carried by the bolts. A bit collar is welded to a bori... | 10/03/2000 |
| 6062325 | Rotary drill bits A rotary drag-type drill bit, for drilling holes in subsurface formations, comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as ... | 05/16/2000 |
| 5950743 | Method for horizontal directional drilling of rock formations A method for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubricatin... | 09/14/1999 |
| 5794728 | Percussion rock drill bit A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at l... | 08/18/1998 |
| 5699868 | Rotary drill bits having nozzles to enhance recirculation A rotary drill bit for drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, and a plurality of blades formed on the leading face of the bit body and extending outwardly away from the axis of the bit toward... | 12/23/1997 |
| 5553682 | Rock drill A rock drill includes an axially elongated shank with a chucking shank part (1) at one end, a drilling shank part (2) extending from the chucking shank part and having at least four drilled material conveying flutes (4, 5, 6, 7) disposed next to one anoth... | 09/10/1996 |
| 5492184 | Earth boring device In an earth boring device with a boring head (14) rotatable about its axis (16), which boring head for the control of its direction has a control surface (18) inclined to its axis (16) and at least one jet (20) for the discharge of a pressurized boring fl... | 02/20/1996 |
| 5148880 | Apparatus for drilling a horizontal controlled borehole in the earth A method and apparatus for drilling a horizontal controlled borehole in the earth includes a drill frame, a drill string and a downhole tool. The drill frame includes a wrench attached to the frame for assisting in breaking and forming joints. The downhol... | 09/22/1992 |
| 5099934 | Rotary drill bits A rotary drill bit comprises a bit body having a shank for connection to a drill string and a passage for supplying drilling fluid to the face of the bit, which carries a plurality of polycrystalline diamond preform cutting elements. In order to reduce bi... | 03/31/1992 |
| 5020608 | Device for boring holes in the ground A device for forming an elongated hole in the ground, comprising a hollow, flexible conduit, a head (2') which is connected to one end of the conduit and which is fitted with at least one nozzle (5') through which fluid passing along the conduit under pre... | 06/04/1991 |
| 4953638 | Method of and apparatus for drilling a horizontal controlled borehole in the earth A method of boring a hole in the earth such as for passing under obstacles, not limited, but including roadways, rivers, dikes, canals or other inexcessible areas where it is impossible to trench a ditch including the steps of advancing a rotating drill s... | 09/04/1990 |
| 4951761 | Rock drill A rock drill having a drilling head which, in an asymmetric arrangement relative to the main cutting tip, has at least one additional secondary cutting tip, the angle enclosed between the single cutting edge of the main cutting tip and the secondary cutti... | 08/28/1990 |
| 4848489 | Drag drill bit having improved arrangement of cutting elements A drag type rotary bit (10) having a plurality of arcuate blades (24A-24E) each having a row of cutting elements (36A-36G) thereon. The cutting elements (36A-36G) are arranged on the arcuate blades (24A-24E) with around one-half of the length of the arcua... | 07/18/1989 |
| 4730682 | Erosion resistant rock drill bit Disclosed herein is an erosion resistant down hole rock drill bit which utilizes a radial distribution of carbide cutter bits or buttons about the exhaust hole. This minimizes carbide wash or removal of base metal which retains the carbide and thereby ext... | 03/15/1988 |
| 4697654 | Rotary drill bits A rotary drill bit for use in drilling deep holes in subsurface formations comprises a bit body having a leading face and a gauge region, a plurality of cutting elements mounted at the surface of the leading face of the bit body, a passage in the bit body... | 10/06/1987 |
| 4682661 | Drilling apparatus A boring head for duo-pipe drilling apparatus comprises a body having a passage for material return extending therethrough from the cutting end to the coupling end, the passage having an inlet at the cutting end displaced from the axis of rotation of the ... | 07/28/1987 |
| 4676324 | Drill bit and cutter therefor A full bore drag-type well drilling bit comprises a bit body having an operating end face defining a plurality of upsets. Each of the upsets has a leading edge surface and at least one recess extending through the leading edge surface into the upset. The ... | 06/30/1987 |
| 4574895 | Solid head bit with tungsten carbide central core A solid head earth boring bit has a central tungsten carbide core sealed at the lower end of a drilling fluid passage that extends through the bit to the face of the bit. The core has a nozzle passage extending through it that is offset from the axis of t... | 03/11/1986 |
| 4334392 | Modular screw anchor having lead point non-integral with helix plate A high strength, modular screw anchor is disclosed which exhibits enhanced failure resistance notwithstanding use of essentially the same amount of material as conventional anchors, and which can be installed using existing installation equipment. The pre... | 06/15/1982 |
| 4304312 | Percussion drill bit having centrally projecting insert A percussion drill bit comprises a bit body including a shaft having a conical mounting portion to be mated with a conical mounting portion of a drill rod by means of substantially longitudinal friction forces. An annular row of circumferentially spaced b... | 12/08/1981 |
| 4299298 | Down-the-hole drilling The invention concerns down-the-hole drilling, where there is a persistent problem in providing an adequately controlled flow of flushing fluid to the face of the drill bit. In known down-the-hole drills turbulence and closed circuits of the flushing flui... | 11/10/1981 |
| 4241800 | Cutting tool for a pneumatic hammer A cutting tool for a pneumatic hammer operative at the bottom of a hole comprising a head for supporting cutting bits and a tail of reduced diameter extending from the head and provided with grooves forming alternating asymmetrical teeth engageable in sym... | 12/30/1980 |
| 4177867 | Self-drilling dowel with an inclined rolling head A self-drilling dowel consists of a tubular-shaped member with a drilling head at one end. The drilling head is formed of a plurality of teeth each having a tip. The tip of the teeth are all disposed in a single plane inclined at an angle to the axis of t... | 12/11/1979 |
| 4098363 | Diamond drilling bit for soft and medium hard formations The invention relates to bore hole drills employing spaced shaped cutters in arrays separated by fluid channels in which there are positioned arrays of nozzles suitable for bit cleaning and detritus removal action.... | 07/04/1978 |
| 4083415 | Mining bit with replaceable work engaging member A mining bit, especially an impact bit for down-the-hole operations and the like, in which the bit comprises a body adapted for being chucked in an impact motor for being impacted by the hammer of the motor and for being rotated by the motor. The working ... | 04/11/1978 |
| 3997011 | Button drill bit structure The specification describes a rock bit of the button type comprising: a drill head body; a bit face part; a friction weld rigidly joining said bit face part to said body; a plurality of bores in the bit face part of said body extending substantially from ... | 12/14/1976 |
| 3955635 | Percussion drill bit A substantially solid drill bit has a relatively flat face at its forward end; the face comprises a plurality of plateaus, preferably three in number, which are separated by radial relief channels that intersect one another near the center of the face. Th... | 05/11/1976 |
| 3941197 | Rotary percussion earth boring bit Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to minimize fatigue failures and reduce manufacturing costs. The body of the bit is formed of a single mass of metal through which extends a single air c... | 03/02/1976 |
