1
Eric F Drake: Methods of manufacturing gradient composite metallic structures. Reed Rock Bit Company, Michael J Caddell, August 16, 1983: US04398952 (132 worldwide citation)

A method is disclosed for forming roller cutters and also for forming cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., by powder metallurgy as a densified powder metallurgical composite of at least two vary ...


2
Eric F Drake, Harold A Sreshta, Nigel Dennis Griffin: Methods of treating preform elements. Camco International, Jeffery E Daly, February 11, 2003: US06517902 (105 worldwide citation)

A method of thermally treating a preform element, of the kind having a facing table of polycrystalline diamond bonded to a substrate of cemented tungsten carbide, comprises the steps of: (a) heating the element to a soaking temperature of 550-625° C., and preferably about 600° C., (b) maintaining th ...


3
Eric F Drake: Aluminide coated bearing elements for roller cutter drill bits. Camco International, Dodge Bush Moseley & Riddle, November 10, 1992: US05161898 (79 worldwide citation)

A roller cutter drill bit (10) has separate bearing elements (82, 84, 86) positioned between a journal (20) and a roller cutter (60) mounted for rotation on the journal (20). The bearing elements (82, 84, 86) are formed of a superalloy material and the bearing surfaces of the bearing elements (82, 8 ...


4
Eric F Drake: Metal cutting tools utilizing gradient composites. Reed Rock Bit Company, Michael J Caddell, January 18, 1983: US04368788 (45 worldwide citation)

A rolling cutter drill bit is disclosed having cutters manufactured by powder metallurgy techniques, said cutters having gradient composite metallic structures in the cutting areas arranged to reduce or eliminate physical and metallic discontinuities and stress risers.


5
Eric F Drake, Harold A Sreshta: Rock bit hardmetal overlay and proces of manufacture. Camco International, Jeffery E Daly, April 4, 2000: US06045750 (40 worldwide citation)

Methods of forming a new wear and abrasion overlay formed with the steel surfaces of components for earth boring bits, and the components formed by the methods are disclosed. The overlay comprises a hard material particulate containing a metal carbide and an alloy steel matrix. The volume fraction o ...


6
Eric F Drake: Cutting teeth for rolling cutter drill bit. Reed Rock Bit Company, Michael J Caddell, February 8, 1983: US04372404 (40 worldwide citation)

Cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., are formed by powder metallurgy as a densified powder metallurgical composite of at least two varying phases, said composite having a substantially continuou ...


7
Eric F Drake, Harold A Sreshta: Rock bit hardmetal overlay and process of manufacture. Camco International, Jeffery E Daly, October 19, 1999: US05967248 (35 worldwide citation)

Methods of forming a new wear and abrasion overlay formed with the steel surfaces of components for earth boring bits, and the components formed by the methods are disclosed. The overlay comprises a hard material particulate containing a metal carbide and an alloy steel matrix. The volume fraction o ...


8
Mou Chih Lu, Eric F Drake: Case hardened roller cutter for a rotary drill bit and method of making. Reed Tool Company, Dodge Bush & Moseley, November 13, 1990: US04969378 (25 worldwide citation)

A roller cutter (28) for a rotary drill bit (10) and method of making, utilizing an ion nitriding hardening process for the external surface (42) and the internal bearing surfaces (33, 34, 38) in the central cavity (30) of the roller cutter (28). The roller cutter (28) is made from a through hardena ...


9
Harold A Sreshta, Eric F Drake: Hardmetal facing for rolling cutter drill bit. Camco International, August 5, 1997: US05653299 (23 worldwide citation)

A steel tooth rolling cutter earth boring drill bit comprises a bit body with a threaded upper end for attachment to the end of a drill string, and a lower end comprising three legs extending downwardly from the bit body and with a rolling cutter rotatably mounted on each leg. A layer of wear resist ...


10
Harold A Sreshta, Eric F Drake: Hardmetal facing for earth boring drill bit. Camco International, Fletcher Yoder & Van Someren, November 23, 1999: US05988302 (18 worldwide citation)

A steel tooth rolling cutter earth boring drill bit includes a bit body with a threaded upper end for attachment to the end of a drill string, and a lower end including three legs extending downwardly from the bit body and with a rolling cutter rotatably mounted on each leg. A layer of wear resistan ...



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