ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,994, issued on March 31, was assigned to Lummus Technology LLC (Houston).

"Enhanced hydrogen recovery utilizing gas separation membranes integrated with pressure swing adsorption unit and/or cryogenic separation system" was invented by Shekhar Tewari (Houston), Ronald M. Venner (Houston), Sunil Panditrao (Houston) and Dennis Maloney (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Processes and systems for recovering hydrogen include feeding a gas stream, comprising hydrogen and additional gases, to a pressure swing adsorption (PSA) system and feeding a membrane permeate stream comprising hydrogen to the PSA system. In the PSA system, a port...