ALEXANDRIA, Va., July 30 -- United States Patent no. 12,370,502, issued on July 29, was assigned to Compact Membrane Systems Inc. (New Castle, Del.).

"Carbon dioxide separation membranes and process" was invented by Ning Shangguan (Cherry Hill, N.J.), Stuart Marshall Nemser (Wilmington, Del.), Sudipto Majumdar (Newark, Del.) and Andrew Edward Feiring (Wilmington, Del.).

According to the abstract* released by the U.S. Patent & Trademark Office: "This invention discloses a thin-film composite membrane and process for the separation of carbon dioxide from non-hydrophilic gases such as methane, hydrogen, and nitrogen. The thin-film composite membrane has a gas-separation layer and a nonporous high-diffusion-rate layer, and has carbon dioxide ...