ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,546,188, issued on Feb. 10.
"Floating valve assembly for drill pipes" was invented by Lorenzo Ernesto Pinto Calvis (Neuquen, Argentina), Carlos Daniel Llorens (Neuquen, Argentina), Pablo Gaston Gonzalez (Neuquen, Argentina) and Pablo Alberto Perotti (Neuquen, Argentina).
According to the abstract* released by the U.S. Patent & Trademark Office: "A floating valve assembly for drill pipes (C). The circulation systems contain conventional and non-conventional oil and gas drilling fluids. The assembly includes a first member device (D1) of the piston or plunger type and a second member device (D2) of the swing check type, which are integrally connected in series and arranged vertically i...