1
Mark L Jones: Drill bit having improved cutter configuration. Eastman Christensen Company, Arnold White & Durkee, April 3, 1990: US04913247 (188 worldwide citation)

The subject drill bits include a body member with cutter blades having a generally parabolic bottom profile. The cutter blades each include a diamond cutting face which increases in vertical height generally as a function of increased distance from the center line of the bit. The increased height al ...


2
Redd H Smith, Craig H Cooley: Rotary drill bit with abrasion and erosion resistant facing. Eastman Christensen Company, Joseph A Walkowski, December 5, 1989: US04884477 (168 worldwide citation)

A rotary drill bit is provided for boring earth formations which includes a bit blank and a metal matrix secured to the blank. The metal matrix includes a filler material dispersed therein. Cutting elements are mounted on the exterior face of the bit, and substantially all of the exposed internal an ...


3
Gordon A Tibbitts, Ralph M Horton, Lorenzo G Lovato: Earth boring drill bit with matrix displacing material. Eastman Christensen Company, Trask Britt & Rossa, February 25, 1992: US05090491 (104 worldwide citation)

A rotary drill bit for drilling earth formations is provided and includes a bit shank, a hard metal matrix secured to a blank and cutting elements on the exterior face thereof. The matrix includes a displacement material having a different composition than the matrix material within the matrix. The ...


4
Alexander K Meskin, Louis K Bigelow: Multi-component cutting element using consolidated rod-like polycrystalline diamond. Eastman Christensen Company, Trask Britt & Rossa, April 27, 1993: US05205684 (102 worldwide citation)

An enlarged diamond table for use as a cutter in rotating drill bits is provided by disposing a plurality of thermally stable or leached polycrystalline diamond (PCD) rod-like elements within a matrix body. In one embodiment the matrix body is impregnated with diamond grit and completely fills the i ...


5
Redd H Smith, Jeffrey B Lund: Preformed elements for a rotary drill bit. Eastman Christensen Company, Joseph A Walkowski, April 24, 1990: US04919013 (94 worldwide citation)

A rotary drill bit and process of fabrication in which internal fluid passages and watercourses of the bit are lined with a hard metal matrix material which renders the fluid passages more resistant to the erosive forces of the drilling fluid is provided. Also, elements such as lands for cutter elem ...


6
Alexander K Meskin, Leo Merrill, Clifford R Pay: Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks. Eastman Christensen Company, Trask Britt & Rossa, July 2, 1991: US05028177 (84 worldwide citation)

A diamond cutter for use in a drill bit having a geometric size and shape normally characterized by unleached diamond product, such as STRATAPAX diamond cutters, can be fabricated by assembling a plurality of prefabricated leached polycrystalline diamond (PCD) elements in an array in a cutting slug. ...


7
Dieter Voelz, Roland Illerhaus: Changeover bit for extended life, varied formations and steady wear. Eastman Christensen Company, Beehler Pavitt Siegemund Jagger Martella & Dawes, September 1, 1987: US04690228 (64 worldwide citation)

A roller cone bit may be used as a rotating drag bit by treating the roller cones as carriers for a plurality of distinguishable types of drag cutters. The roller cones are each coupled to a mechanism which selectively allows rotation of the roller cones. The roller cones are otherwise fixed and as ...


8
Alfred Ostertag, Hans Schillinger: Stabilizer for deep well drilling tools. Eastman Christensen Company, Arnold White & Durkee, August 8, 1989: US04854403 (63 worldwide citation)

A stabilizer for deep well drilling tools is disclosed which includes a tubular outer casing having a plurality of slit openings distributed around its periphery with a tubular adjusting mandrel supported in the casing for relative axial movement therewith in response to well fluid pressure applied ...


9
Gordon A Tibbitts: Replaceable cutter using internal ductile metal receptacles. Eastman Christensen Company, J A Walkowski, M L Lynch, October 31, 1989: US04877096 (46 worldwide citation)

A replaceable stud cutter for use in matrix drag bit is provided by furnacing a ductile metallic receptacle within the body of the drag bit as it is fabricated. The metal receptacle is characterized by having a receiving cavity defined therein and by including various mechanisms such as grooves or f ...


10
Oleg Kotlyar: Mud pulse valve and method of valving in a mud flow for sharper rise and fall times, faster data pulse rates, and longer lifetime of the mud pulse valve. Eastman Christensen Company, Arnold White & Durkee, September 4, 1990: US04953595 (46 worldwide citation)

Pulse rates, rise and fall times of pulses and lifetimes of mud pulsing valves are substantially increased by providing a valve with a plurality of openable ports which simultaneously open and close to provide a collective flow path of the mud through the valve. By employing a plurality of ports, in ...