ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,218, issued on Oct. 21.
"Friction roller for conveyor" was invented by Gye Yong Heo (Gimhae-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A friction roller for conveyor, includes: a shaft; a sprocket which is rotatably coupled to the shaft and has a retainer coupled to the front of a sprocket body; and a conveyor roller comprising a plurality of rotating balls which are located among a plurality of rotating protrusions protruding forwardly from a retainer body of the retainer, an inner wheel body which is fixed to the shaft and has the outer circumferential surface coming into contact with the rotating balls, and an outer wheel body...