ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,118, issued on Jan. 13, was assigned to Halliburton Energy Services Inc. (Houston).
"Gas tight ball seat system" was invented by Peter D W Inglis (Arbroath, Great Britain) and David John O'Sullivan (Arbroath, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "The embodiments herein provide a ball valve assembly comprising a ball with an external piston that is biased against the ball to create an external seat at a surface of the ball on the down hole side of the ball as well as an internal piston that is biased against the ball to create an internal seat at a surface of the ball also on the down hole side of the ball. Some embodiments als...