US Patent Issued to L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude on Sept. 15 for "Membrane permeate recycle with pressurized anaerobic digesters" (Delaware Inventors)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,734,475, issued on Sept. 15, was assigned to L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude (Paris).

"Membrane permeate recycle with pressurized anaerobic digesters" was invented by Min Ho Maeng (Newark, Del.), Sudhir Kulkarni (Wilmington, Del.) and Shu Fang (Newark, Del.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system for upgrading biogas through a membrane separation process comprises an anaerobic digester, operated under an operation pressure higher than atmosphere pressure, preferably greater than 4 baba, generating the biogas, a first membrane stage and a second membrane stage, separating the bioga...