ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,650, issued on April 15, was assigned to Hyundai Motor Co. (Seoul, South Korea) and Kia Corp. (Seoul, South Korea).

"Method and device for calculating concentration of hydrocarbon in fuel evaporation gas of vehicle" was invented by Jung Seop Son (Seoul, South Korea), Taegon Noh (Seoul, South Korea) and HyungSeok Yoon (Hwaseong-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method includes calculating a first fuel evaporation gas density in a purge pump of a vehicle based on a pressure difference between a front end and a rear end of the purge pump, a radius of a fluid passage of the purge pump, a number of rotations of the purge pum...