Inventor

LOFTON JOHN

US2 patents

Patents

2 patents

US6938707B2Sep 6, 2005

Method and system for minimizing circulating fluid return losses during drilling of a well bore

CHEVRON USA INC24 citations90

US8353351B2Jan 15, 2013

System and method for regulating pressure within a well annulus

CHEVRON USA INC10 citations79