James L. Duggan

Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies

Steel body drill bits with tailored hardfacing structural elements

Methods of attaching a shank to a body of an earth-boring drilling tool, and tools formed by such methods

Cutting element retention apparatus for use in steel body rotary drill bits, steel body rotary drill bits so equipped, and method of manufacture and repair therefor

Methods of manufacturing and repairing rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses

Methods of attaching a shank to a body of an earth-boring tool including a load-bearing joint and tools formed by such methods

Shrink fit sleeve assembly for a drill bit, including nozzle assembly and method thereof

Earth-boring tools having pockets for receiving cutting elements therein and methods of forming such pockets and earth-boring tools

Rock bit nozzle arrangement

Method of manufacturing a rotary drill bit