ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,427,460, issued on Sept. 30, was assigned to Foseco International Ltd. (Derbyshire, Great Britain).
"Refractory filter" was invented by David Bell (Stone, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A refractory filter suitable for filtering molten metal, such as steel, and a method and powdered composition for producing the filter. The filter comprises refractory material, the refractory material comprising: 60-90 wt % alumina; 8-30 wt % zirconia; and 3-20 wt % magnesia. The powdered composition comprises: 60-90 wt % alumina; 8-30 wt % zirconia; and 3-20 wt % magnesia, wherein the powdered composition comprises less than 12.5 wt % rea...