ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,534,894, issued on Jan. 27, was assigned to Tai-World Mfg. Co. Ltd. (Changhua, Taiwan).
"Water stop structure of drain valve" was invented by Sen-Tien Shih (Changhua, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A water stop structure of a drain valve contains a body, a ball valve, a first support ring, a second support ring, a positioning ring, a control device, and a filter basket. At least two arcuate protrusions of a second support ring and at least two arcuate recesses of a body changeably contact with one another to produce a water-stopping effect. When the ball valve is adjustably rotated, a second support ring automatically moves upward...