Inventor
MARSHALL ALAN J
US8 patents
⚠️ This page may combine multiple inventors who share the name “MARSHALL ALAN J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SMITH INTERNATIONAL
4 patentsUS7997346B2Aug 16, 2011
Percussion drilling assembly with annular locking member
SMITH INTERNATIONAL8 citations81
US7428938B2Sep 30, 2008
Percussion bit drill drive collar with retention mechanism and method of assembling
SMITH INTERNATIONAL9 citations81
US8763729B2Jul 1, 2014
Percussion drilling assembly and hammer bit with gage and outer row reinforcement
SMITH INTERNATIONAL2 citations59
US9605485B1Mar 28, 2017
Percussion drilling assembly and hammer bit with gage and outer row reinforcement
SMITH INTERNATIONAL0 citations48
MARSHALL ALAN J
3 patentsUS8312944B2Nov 20, 2012
Percussion hammer bit with a driver sub including a guide sleeve portion
MARSHALL ALAN J11 citations76
US8312613B2Nov 20, 2012
Percussion drilling assembly with annular locking member
MARSHALL ALAN J5 citations59
US8061450B2Nov 22, 2011
Percussion drilling assembly having erosion retarding casing
MARSHALL ALAN J2 citations59