1
David R Hall: Composite polycrystalline diamond compact. Smith International, Willian Brinks Olds Hofer Gilson & Lione, August 5, 1986: US04604106 (372 worldwide citation)

The invention is a composite polycrystalline diamond compact comprising at least one layer of diamond crystals and precemented carbide pieces which have been pressed under sufficient heat and pressure to create composite polycrystalline material wherein polycrystalline diamond and the precemented ca ...


2
David R Hall: Diamond thrust bearing and method for manufacturing same. Anadrill, Workman Nydegger & Jensen, March 3, 1992: US05092687 (269 worldwide citation)

A diamond thrust bearing and method for manufacturing the diamond thrust bearing wherein diamond bearing pads are interference fitted at ambient temperatures into a plurality of equidistantly spaced bearing pad recesses located in a circle in a receiving surface of a bearing pad retainer. The bearin ...


3
David R Hall: Rock bit with diamond tip inserts. Smith International, Christie Parker & Hale, September 22, 1987: US04694918 (251 worldwide citation)

A percussion rock bit comprises a steel body having means for connection to a drill string at one end and having a plurality of inserts at the other end for crushing rock at the bottom of a hole being drilled. The inserts have a cemented tungsten carbide body partially embedded in the steel bit and ...


4
David R Hall, Donald G Cross: Polycrystalline diamond bearing system for a roller cone rock bit. Smith International, Willian Brinks Olds Hofer Gilson & Lione, April 19, 1988: US04738322 (244 worldwide citation)

A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise p ...


5
David R Hall, H Tracy Hall Jr, David Pixton, Scott Dahlgren, Joe Fox: Downhole data transmission system. Novatek Engineering, Brinks Hofer Gilson & Lione, December 30, 2003: US06670880 (229 worldwide citation)

A system for transmitting data through a string of downhole components. In one aspect, the system includes first and second magnetically conductive, electrically insulating elements at both ends of the component. Each element includes a first U-shaped trough with a bottom, first and second sides and ...


6
David R Hall: Polycrystalline diamond body with enhanced surface irregularities. Megadiamond, Willian Brinks Olds Hofer Gilson & Lione, December 16, 1986: US04629373 (211 worldwide citation)

A polycrystalline diamond body with a plurality of faces having enhanced surface irregularities over at least a portion of at least one of the faces is disclosed. The polycrystalline diamond body with the enhanced surface irregularities attaches to other materials such as metal by conventional mount ...


7
David R Hall, Joe Fox: Annular wire harness for use in drill pipe. May 21, 2002: US06392317 (183 worldwide citation)

An annular wire harness for use in drill pipe comprising two rings interconnected by one or more insulated conductors. The rings are positioned within annular grooves located within the tool joints and the conductors are fixed within grooves along the bore wall of the pipe. The rings may be recessed ...


8
David R Hall, Donald G Cross: Polycrystalline diamond bearing system for a roller cone rock bit. Smith International, Willian Brinks Olds Hofer Gilson & Lione, February 7, 1989: US04802539 (149 worldwide citation)

A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise p ...


9
David R Hall: Transistion layer polycrystalline diamond bearing. Smith International, Willian Brinks Olds Hofer Gilson & Lione, March 8, 1988: US04729440 (140 worldwide citation)

An earth boring apparatus is disclosed having bearing members comprised of transition layer polycrystalline diamond. The transition layer polycrystalline diamond bearings include a polycrystalline diamond layer interfaced with a composite transition layer comprising a mixture of diamond crystals and ...


10
David R Hall: Composite polycrystalline diamond. Megadiamond, Willian Brinks Olds Hofer Gilson & Lione, June 25, 1985: US04525178 (131 worldwide citation)

A composite material is described which includes a mixture of individual diamond crystals and pieces of precemented carbide. The mixture is heated and pressurized to create intercrystalline bonds between the diamond crystals and chemical bonds between the diamond crystals and the precemented carbide ...