ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,590, issued on June 17, was assigned to Jiani Zhong (Guangdong, China).
"Curtain roller" was invented by Jianghai Sun (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A curtain roller includes a main body of roller and a stop part. The main body of roller is connected with a curtain, and the main body of roller is capable of rotating on a surface of the curtain to a winding position or an unfolding position. When the main body of roller rotates to the winding position, the main body of roller rolls up the curtain. When the main body of roller rotates to the unfolding position, the main body of roller unfolds the curtain. The stop par...