ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,734,474, issued on Sept. 15, was assigned to UBE Corp. (Ube, Japan).

"Gas separation system and method for producing methane-enriched gas" was invented by Kensuke Furue (Ube, Japan), Shota Kitai (Ube, Japan), Takumi Fukunaga (Ube, Japan), Nobuhiko Fukuda (Ube, Japan) and Tomohide Nakamura (Ube, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A gas separation system for producing a CH4-enriched gas from a feedstock gas containing CO2 and CH4, including a first gas separation membrane unit and a second gas separation membrane unit, in which the gas separation system includes a feedstock gas supply line connected to a gas inlet of the first gas separ...