ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,455, issued on Sept. 23, was assigned to Qingdao University of Science and Technology (Qingdao, China).

"Method and device for regulating waste organic polymer material pyrolysis products" was invented by Xiaolong Tian (Qingdao, China), Chuansheng Wang (Qingdao, China) and Kongshuo Wang (Qingdao, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and a device for regulating waste organic polymer material pyrolysis products are provided. Waste organic polymer materials are uniformly mixed with a composite auxiliary agent for removing harmful elements at a mass ratio of 90:10 and subjected to pyrolysis at 400-450deg C. Resulting primary py...