ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,344, issued on Sept. 16, was assigned to UNILIN BV (Wielsbeke, Belgium).

"Co-extrusion SPC foam flooring and manufacturing method thereof" was invented by Jiangang Song (Zhejiang, China), Jiajin Fu (Zhejiang, China) and Fuqing Liu (Zhejiang, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A foam flooring includes a stone-plastic base material structure, which sequentially comprises, from top to bottom, a first stable layer, a foaming layer and a second stable layer. The first stable layer and the second stable layer are both sheets with a PVC resin and filler powder as main components, with 25-40 parts by mass of the PVC resin and 55-75 parts ...