ALEXANDRIA, Va., June 25 -- United States Patent no. 12,337,437, issued on June 24, was assigned to Sintokogio Ltd. (Nagoya, Japan).
"Barrel polishing device" was invented by Hitoshi Nishijima (Aichi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A barrel polishing apparatus according to an aspect includes a fixed tank and a rotary disk that define a polishing space. The fixed tank has a predetermined axis as a center axis. The fixed tank includes a cylindrical rigid body and a first lining covering an inner circumferential surface of the cylindrical rigid body. The rotary disk has a disk-shaped rigid body and a second lining covering a surface of the disk-shaped rigid body on the polishing space side...