1
John Fuller, Joseph A Gasan: Rotary drill bit for use in drilling holes in subsurface earth formations. Reed Tool Company, Browning Bushman Anderson & Brookhart, February 12, 1991: US04991670 (118 worldwide citation)

A rotary drill bit for use in drilling holes in subsurface earth formations comprises a bit body having a shank at one end for connection to a drill string and an operating end face at the other end. A plurality of first cutting structures, each comprising a preform cutting element, is mounted in th ...


2
John M Clegg, Malcolm R Taylor, Leslie R Hawke: Notary drill bits. Reed Tool Company, Browning Bushman Anderson & Brookhart, June 9, 1992: US05119892 (99 worldwide citation)

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. The cutting elements on one side of a diameter of the bit have pos ...


3
John Fuller, Michael C Regan: Cutting structures for steel bodied rotary drill bits. Reed Tool Company, Browning Bushman Anderson & Brookhart, April 24, 1990: US04919220 (93 worldwide citation)

A rotary drill bit for use in drilling or coring holes in subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of cutting structures mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of ...


4
John D Barr: Manufacture of rotary drill bits. Reed Tool Company, Browning Bushman Zamecki & Anderson, October 25, 1988: US04780274 (70 worldwide citation)

A method of manufacturing by a powder metallurgy process a rotary drill bit including a bit body having a plurality of cutting elements mounted on the outer surface thereof comprises the steps of forming a hollow mould for moulding at least a portion of the bit body, packing the mould with powdered ...


5
John D Barr, Thomas A Newton Jr: Cutting elements for rotary drill bits. Reed Tool Company, Browning Bushman Anderson & Brookhart, June 25, 1991: US05025874 (69 worldwide citation)

A preform cutting element for a rotary drill bit includes a layer of polycrystalline diamond material, the rear face of which is bonded to the front face of a backing layer of less hard material, such as tungsten carbide. The rear face of the backing layer is substantially greater in area than the r ...


6
John D Deane, Craig R Ivie, Percy W Schumacher: Cutting elements for roller cutter drill bits. Reed Tool Company, Dodge Bush & Moseley, July 10, 1990: US04940099 (65 worldwide citation)

A rotary drill bit (10) having a plurality of roller cutters (20) with rows (32A, 32B, 32C, 32D) of cutting inserts (34,36,38,40) mounted within sockets (35,46) on the frusto-conical cutter body (30). The cutting inserts 34,36,38,40) have cutting surfaces formed with a wear-resistant material with c ...


7
Nigel D Griffin: Manufacture of cutting structures for rotary drill bits. Reed Tool Company, Browning Bushman Anderson & Brookhart, September 11, 1990: US04956238 (62 worldwide citation)

A cutting structure, for a rotary drill bit, is of the kind comprising a preform cutting element having a front cutting face formed of superhard material, such as polycrystalline diamond, and a rear face bonded to a carrier of less hard material, such as cemented tungsten carbide. The cutting elemen ...


8
Thomas A Newton Jr, Michael C Regan: Rotary drill bits. Reed Tool Company, Browning Bushman Zamecki & Anderson, July 4, 1989: US04844185 (59 worldwide citation)

A rotary drill bit for use in drilling or coring deep holes in subsurface formations comprises a bit body having a leading face and a gauge region, cutting elements mounted at the leading face of the bit body, and a passage in the bit body communicating with nozzles in the leading face of the bit bo ...


9
Charles M Thompson: Cutting means for drag drill bits. Reed Tool Company, Vinson & Elkins, August 19, 1986: US04606418 (43 worldwide citation)

A rotary drill bit (10) having a plurality of diamond cutting elements (48) each having a cutting face (60) with a discharge nozzle (64) therein. The discharge nozzle (64) directs the flow of drilling fluid away from the cutting face (60) and is surrounded by the cutting face (60).


10
Joseph A Gasan, Malcolm R Taylor, Phillip Bex: Cutter elements for rotary drill bits. Reed Tool Company, Browning Bushman Anderson & Brookhart, January 29, 1991: US04987800 (39 worldwide citation)

A preform cutting element, for a rotary drill bit, includes a layer of polycrystalline diamond material having a front cutting face, a rear face and a peripheral surface, a cutting edge being provided by at least part of the junction between the front cutting face and the peripheral surface. The dia ...



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