Inventor

DARNELL WILLIAM J

US4 patents

⚠️ This page may combine multiple inventors who share the name “DARNELL WILLIAM J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

PETROQUIP ENERGY SERVICES LP

1 patent

US7921922B2Apr 12, 2011

Formation saver sub and method

PETROQUIP ENERGY SERVICES LP14 citations74

PETROQUIP ENERGY SERVICES LLP

1 patent

US7617875B2Nov 17, 2009

Shifting apparatus and method

PETROQUIP ENERGY SERVICES LLP8 citations74

DARNELL WILLIAM J

1 patent

US8151891B1Apr 10, 2012

Formation saver sub and method

DARNELL WILLIAM J6 citations73

LONG RODNEY WAYNE

1 patent

US9086286B2Jul 21, 2015

Goggles for use in water

LONG RODNEY WAYNE2 citations50