ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,280, issued on Jan. 13, was assigned to NTOP ENGINEERING INC. (Incheon, South Korea).

"Continuously variable transmission drive system for electric vehicles with improved driving performance and energy efficiency" was invented by Young Keun Jeon (Incheon, South Korea), Jong Hyeon Park (Seoul, South Korea) and Dong Hwan Park (Anyang-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention of continuously variable transmission drive system for electric vehicles comprises a housing 210, a first motor 220, a second motor 230, a first gear assembly 240 including a sun gear 241 having a main input shaft 241a connected to a first motor ...