ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,840, issued on June 17, was assigned to HUNAN ZOY TECHNOLOGY Co. LTD. (Changsha, China).

"Integrated air inlet and outlet valve and pressure swing adsorption air path system" was invented by Gang Huang (Changsha, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An integrated air inlet and outlet valve and a pressure swing adsorption air path system including the same are disclosed. The integrated air inlet and outlet valve includes a valve body with an air inlet, an air outlet, an exhaust port, a first blowback air inlet and two air path control units. The air path control unit includes a first air inlet and outlet port connected with the air ou...