Inventor
UNDERWOOD LANCE D
US39 patents
⚠️ This page may combine multiple inventors who share the name “UNDERWOOD LANCE D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SMITH INTERNATIONAL
19 patentsUS7513318B2Apr 7, 2009
Steerable underreamer/stabilizer assembly and method
SMITH INTERNATIONAL88 citations98
US7353845B2Apr 8, 2008
Inline bladder-type accumulator for downhole applications
SMITH INTERNATIONAL75 citations97
US7506703B2Mar 24, 2009
Drilling and hole enlargement device
SMITH INTERNATIONAL48 citations96
US5171139ADec 15, 1992
Moineau motor with conduits through the stator
SMITH INTERNATIONAL99 citations94
US4944774AJul 31, 1990
Hard facing for milled tooth rock bits
SMITH INTERNATIONAL60 citations94
US4836307AJun 6, 1989
Hard facing for milled tooth rock bits
SMITH INTERNATIONAL99 citations94
US7735581B2Jun 15, 2010
Locking clutch for downhole motor
SMITH INTERNATIONAL25 citations92
US4711311ADec 8, 1987
Vibration and erosion resistant nozzle
SMITH INTERNATIONAL27 citations92
US7861802B2Jan 4, 2011
Flexible directional drilling apparatus and method
SMITH INTERNATIONAL12 citations84
US7597158B2Oct 6, 2009
Drilling and hole enlargement device
SMITH INTERNATIONAL9 citations84
US7267185B2Sep 11, 2007
Bit retainer system
SMITH INTERNATIONAL18 citations83
US9915106B2Mar 13, 2018
U-joint for a downhole motor drive shaft
SMITH INTERNATIONAL9 citations79
US7343989B2Mar 18, 2008
Secondary retainer for a downhole hammer bit
SMITH INTERNATIONAL5 citations74
US4501338AFeb 26, 1985
Grease pump for sealed bearing rotary cone rock bits
SMITH INTERNATIONAL8 citations74
US9611846B2Apr 4, 2017
Flow restrictor for a mud motor
SMITH INTERNATIONAL3 citations73
US9982485B2May 29, 2018
Positive displacement motor with radially constrained rotor catch
SMITH INTERNATIONAL3 citations71
US9695638B2Jul 4, 2017
Positive displacement motor with radially constrained rotor catch
SMITH INTERNATIONAL5 citations71
US7665548B2Feb 23, 2010
Secondary retainer for a downhole hammer bit
SMITH INTERNATIONAL3 citations63
US9187955B2Nov 17, 2015
Locking clutch for downhole motor
SMITH INTERNATIONAL1 citations51
HALLIBURTON CO
3 patentsUS5332048AJul 26, 1994
Method and apparatus for automatic closed loop drilling system
HALLIBURTON CO376 citations99
US5318137AJun 7, 1994
Method and apparatus for adjusting the position of stabilizer blades
HALLIBURTON CO166 citations99
US5318138AJun 7, 1994
Adjustable stabilizer
HALLIBURTON CO210 citations99
HALLIBURTON ENERGY SERV INC
3 patentsUS6309195B1Oct 30, 2001
Internally profiled stator tube
HALLIBURTON ENERGY SERV INC99 citations96
US6568076B2May 27, 2003
Method of making an internally profiled stator tube
HALLIBURTON ENERGY SERV INC52 citations94
US5857531AJan 12, 1999
Bottom hole assembly for directional drilling
HALLIBURTON ENERGY SERV INC141 citations94