ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,551,039, issued on Feb. 17, was assigned to Shanghai BackRobo Wellness Co. Ltd. (Shanghai).
"Buoyancy-type pillow with combined action of gas and liquid media" was invented by Wenchao Liu (Shanghai), Qiao Zhao (Shanghai) and Jichang Du (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A buoyancy-type pillow with a combined action of gas and liquid media is provided. The pillow includes a first pillow body, a second pillow body stacked on a top of the first pillow body, and an interlayer support pad located in an inner cavity of the second bladder. The first pillow body includes a first bladder having a flat shape, the inner cavity of the first bl...