ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,392,144, issued on Aug. 19, was assigned to JIANGSU BBL HOME TECHNOLOGY Co. LTD. (Changzhou, China).

"Multi-layer foamed floorboard and preparation method thereof" was invented by Hongkai Xu (Changzhou, China), Yanhui Li (Changzhou, China) and Junxiang Dong (Changzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A multi-layer foamed floorboard and its preparation method are provided. The multi-layer foamed floorboard includes a surface layer and a core layer with a surface layer-core layer-surface layer structure. Raw materials of the surface layer include a first polyvinyl chloride (PVC) resin powder, a first calcium carbonate powder, a recycl...