ALEXANDRIA, Va., April 21 -- United States Patent no. 12,604,994, issued on April 21, was assigned to Zhejiang Natural Outdoor Goods Inc. (Taizhou, China).
"Thickness-adjustable air mattress structure" was invented by Yonghui Xia (Taizhou, China), Junwei Yao (Taizhou, China), Wenwen Ji (Taizhou, China), Weiyi Ma (Taizhou, China) and Zirui Cai (Taizhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A thickness-adjustable air mattress structure includes an airbag body and an elastic sponge. The airbag body is provided with an air chamber. The elastic sponge is in the shape of a square or long strip and provided in the air chamber. An upper surface of the elastic sponge is fixedly connected to an upper s...