US Patent Issued to Halliburton Energy Services on May 6 for "Tubing retrievable safety valve assembly with secondary flapper and seat" (Singaporean Inventors)

ALEXANDRIA, Va., June 10 -- United States Patent no. 12,291,941, issued on May 6, was assigned to Halliburton Energy Services Inc. (Houston).

"Tubing retrievable safety valve assembly with secondary flapper and seat" was invented by Merced Gonzalez (Singapore) and Charles David McFate (Singapore).

According to the abstract* released by the U.S. Patent & Trademark Office: "A tubing retrievable safety valve assembly and related methods are disclosed herein. The assembly includes a primary flapper, a secondary flapper, a flow tube, and a protective sleeve. The flow tube is shiftable between a downhole position that holds the primary flapper in an open position and an uphole position that allows the primary flapper to move to a closed positio...