ALEXANDRIA, Va., March 3 -- United States Patent no. 12,564,806, issued on March 3, was assigned to Filter Preaux LLC (Baton Rouge, La.).

"Cartridge filter cleaning system and method" was invented by Earl L. Ewen (Prairieville, La.) and Kenneth W. Jones (Baton Rouge, La.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A filter cleaning system with a cleaning chamber. The cleaning chamber has a container, a plurality of shafts and a plurality of nozzles inside of the container, and an outlet. The shafts extend along a length of the cleaning chamber and are configured to support a cylindrical filter. Each of the shafts is rotatable with respect to the chamber and is configured to cause the filter to rotate abou...