ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,873, issued on Oct. 7, was assigned to JFE Steel Corp. (Tokyo).
"Radiant tube" was invented by Tomoyuki Kawashima (Tokyo), Akihiro Kobayashi (Tokyo) and Noriko Ozawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A radiant tube includes a conduit; and one or more heat transfer promoters disposed in the conduit, wherein the heat transfer promoter includes a body part on a center side of the conduit, and protruding parts protruding from the body part toward an inner wall surface of the conduit, the protruding parts are on an outer periphery of the body part to be arranged in a circumferential direction of the conduit, the protruding parts includ...