ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,490,839, issued on Dec. 9, was assigned to Jiangsu Sea-Lion Machinery Co. Ltd. (Zhangjiagang, China).
"Mattress cleaning machine" was invented by Hong Chen (Zhangjiagang, China), Shengang Cai (Zhangjiagang, China), Yexin Li (Zhangjiagang, China), Lunan Wang (Zhangjiagang, China) and Qiaoyun Xiang (Zhangjiagang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A mattress cleaning machine, including a frame and a horizontal cylinder provided inside the frame. The inside of the horizontal cylinder is provided with a cuboid inner container, two ends of the cuboid inner container are rotatably mounted to the horizontal cylinder, one side of the cuboid inn...