ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,963, issued on Sept. 15, was assigned to Weatherford Technology Holdings LLC (Houston).
"Gas lift valve having ratcheting orifice" was invented by Donavan H. Brown (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A gas lift valve is opened and closed by subjecting a pressure-sensitive piston to pressure differentials between annulus and tubing pressures. The piston can be held in (and released from) a closed position by rotatably indexing an indexing assembly in incremental rotations on the piston when in the closed position. The indexing assembly is rotated when the piston is alternatingly moved in opposing axial directions when the pressur...