ALEXANDRIA, Va., June 18 -- United States Patent no. 12,326,297, issued on June 10, was assigned to QINGDAO JIAHE YONGRUN BEAUTY TECHNOLOGY Co. LTD. (Qingdao, China).
"Vacuum drying tank" was invented by Chao Yu (Shandong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a vacuum drying tank, including a shell and a pumping device. The shell includes a first shell part, a second shell part, and a third shell part; the second shell part has an accommodating cavity provided with an opening in the top; an air pumping hole is formed in the accommodating cavity; the first shell part is, hermetically covered at the opening; the third shell part is arranged below the second shel...