ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,491,477, issued on Dec. 9.
"Membrane filter unit" was invented by Xuefang Chen (Hangzhou Bay New Area Ningbo, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a membrane filter unit which includes: a filter case for housing a membrane; an inner tube housing a wastewater chamber and a hollow core tube, a middle tube housing a pure water chamber; the hollow core tube having a top opening at a top end and a bottom opening at a bottom end, and having a water collecting channel on its outer wall and positioned coaxially inside the case, wherein the top opening is adapted to open into the wastewater chamber; and a membrane having an inner peri...