ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,876, issued on March 18, was assigned to Taizhou Langxun Electronics Co. LTD (Taizhou, China).
"Floor drain" was invented by Rongwei Cai (Taizhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A floor drain includes a floor drain edge portion, a floor drain waist, a load-bearing portion, and a counterweight element. The floor drain edge portion has an outer edge and a circular inner edge. The floor drain waist is formed by extending inward and upward from the circular inner edge, and a distal end of the floor drain waist forms a waist edge. The load-bearing portion is connected to the waist edge. The counterweight element is disposed on the ...