ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,464, issued on Feb. 3, was assigned to GUANGZHOU RISING DRAGON RECREATION INDUSTRIAL Co. LTD. (Guangzhou, China).
"Drain valve for bathroom" was invented by Huaibin Zhao (Guangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drain valve comprises a valve shell and a valve core which comprises an inner core and an outer core. In the process of draining and closing, the outer core and the inner core of the valve is rotated through operating the handle nut and a rotating part, so as to realize the accurate control of the position of the valve core. When draining water, the first through hole and the second through hole are aligned, and then ...