ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,378, issued on Nov. 25, was assigned to Welltec Manufacturing Center Completions ApS (Esbjerg N, Switzerland).
"Annular barrier with valve unit" was invented by Ricardo Reves Vasques (Zug, Switzerland) and Bala Prasad (Zug, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an annular barrier for providing zonal isolation in an annulus downhole between a well tubular metal structure and another well tubular metal structure or a wall of a borehole, comprising a tubular metal part configured to be mounted as part of the well tubular metal structure and having an inside and an axial extension along the well tubu...