ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,974, issued on March 25, was assigned to GREEN TECH Co. Ltd (Gyeongsangbuk-do, South Korea).
"Impeller" was invented by Jung Gon Lee (Daegu, South Korea), Seung Min Lee (Daegu, South Korea), Min Seok Kwak (Daegu, South Korea) and Nam Hoon Kim (Daegu, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "An impeller includes a hub, and a vain unit provided radially at a position spaced apart by a predetermined distance based on the hub. The vane unit is configured to begin at a position spaced apart by a predetermined radius based on the hub and to end to be formed into a streamlined shape in which a beginning portion becomes narrower in width ...