1
David Truax, Douglas Caraway, Stephen M Evans, Andrew Murdock: In or relating to rotary drill bits. Camco Drilling Group of Hycalog, March 31, 1998: US05732783 (87 worldwide citation)

A drill bit comprises a main body part having a shank for connection to a drill string, an end face, an internal passage for supplying drilling fluid to the end face, a number of blades extending from the end face outwardly and longitudinally of the central axis of rotation of the bit, and a number ...


2
Stephen M Evans: Wear resistant drill bit. Camco International, Jeffery E Daly, September 24, 2002: US06454028 (67 worldwide citation)

A wear resistant drill bit of the matrix bodied type has a bit body comprising a tungsten carbide material bound with a binder material, wherein the tungsten carbide material includes at least some tungsten carbide particles of generally spherical shape. The tungsten carbide material includes partic ...


3
Stephen M Evans: Manufacture of rotary drill bits. Camco Drilling Group, June 20, 1995: US05425288 (23 worldwide citation)

A method of manufacturing a rotary drill bit includes the steps of forming the bit body with a plurality of sockets, inserting in each socket a projecting carbon former, applying a fusible hard facing material to the surface of the bit body, and around the formers, by the localised application of he ...


4
David Truax, Douglas Caraway, Stephen M Evans, Andrew Murdock: Matrix hard facing by lost wax process. Camco International, August 31, 1999: US05944128 (12 worldwide citation)

A drill bit comprises a main body part having a shank for connection to a drill string, an end face, an internal passage for supplying drilling fluid to the end face, a number of blades extending from the end face outwardly and longitudinally of the central axis of rotation of the bit, and a number ...


5
Stephen M Evans: Method for securing composition board panels together. Howard E Moore, Larry B Dwight, March 4, 1980: US04191606 (5 worldwide citation)

A method and apparatus for securing two ribbed panels of composition board together to form a single panel having two outer flat surfaces. The method comprises positioning panels on opposite sides of a support member and temporarily securing them to same. An adhesive is applied to the edges of the r ...


6
Stephen M Evans: Vehicular accident locator and identification system. June 8, 1999: US05910766 (5 worldwide citation)

A vehicular accident locator system is provided including a plurality of sensor assemblies each including a brittle conductive element. The sensor assemblies are mounted throughout the body and the elements thereof are connected in series via insulated wires. As such, an activation signal is transmi ...


7
Stephen M Evans: Wear resistant drill bit. Schlumberger Oilfield Services, Jeffrey E Daly, July 4, 2002: US20020084111-A1

A wear resistant drill bit of the matrix bodied type has a bit body comprising a tungsten carbide material bound with a binder material, wherein the tungsten carbide material includes at least some tungsten carbide particles of generally spherical shape. The tungsten carbide material includes partic ...