ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,125, issued on Oct. 21.
"Heat exchange flue and heat exchange device" was invented by Chengguo Ma (Shuangyashan, China) and Zihe Ma (Shuangyashan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A heat exchange flue has a top flue gas chamber, a bottom flue gas chamber, and a heat exchange section located therebetween that includes a heat exchange tube bundle located in the middle and a left side flue and a right side flue located at two sides of the heat exchange tube bundle. The axis of the heat exchange tube bundle is positioned in a vertical plane extending substantially forward and backward, allowing the flue gas to laterally flush against...