Inventor
BLACK BOYD
US5 patents
Patents
5 patentsUS8950517B2Feb 10, 2015
Drill bit with a retained jack element
HALL DAVID R20 citations92
US7506706B2Mar 24, 2009
Retaining element for a jack element
HALL DAVID R11 citations83
US7984520B2Jul 26, 2011
Water closet
HALL DAVID R5 citations61
US7908851B2Mar 22, 2011
Hydraulic energy storage with reinforced layer
HALL DAVID R2 citations60
US7526918B2May 5, 2009
Hydraulic energy storage with reinforced layer
HALL DAVID R3 citations60