Inventor
LLEWELLYN BRIAN C
US6 patents
⚠️ This page may combine multiple inventors who share the name “LLEWELLYN BRIAN C”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CHEVRON USA INC
5 patentsUS7441599B2Oct 28, 2008
Controlling the pressure within an annular volume of a wellbore
CHEVRON USA INC34 citations95
US7743830B2Jun 29, 2010
Controlling the pressure within an annular volume of a wellbore
CHEVRON USA INC12 citations92
US7963333B2Jun 21, 2011
Controlling the pressure within an annular volume of a wellbore
CHEVRON USA INC7 citations83
US7870905B2Jan 18, 2011
Controlling the pressure within an annular volume of a wellbore
CHEVRON USA INC10 citations83
US7950460B2May 31, 2011
Controlling the pressure within an annular volume of a wellbore
CHEVRON USA INC4 citations73