ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,383,457, issued on Aug. 12, was assigned to Dongguan Rijie Electronic Technology Co. Ltd. (Guangdong, China).
"Internal sucking massage stick structure" was invented by Quan Zhao (Guangdong, China) and Lang Cun (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An internal sucking massage stick structure, includes a hard shell, a flexible wall and a driving apparatus, the hard shell is provided with an inner cavity, the inner cavity is provided with at least one concave part penetrating through the side wall of the hard shell, the flexible wall covers the peripheral wall of the hard shell, the flexible wall shields the concave part to form...