ALEXANDRIA, Va., June 4 -- United States Patent no. 12,322,969, issued on June 3, was assigned to Mitsubishi Electric Corp. (Tokyo).

"Power conversion system" was invented by Shuhei Fujiwara (Tokyo), Yoshiyuki Kono (Tokyo), Ryosuke Uda (Tokyo), Takuya Kajiyama (Tokyo) and Toshiyuki Fujii (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A power conversion system includes a plurality of power conversion devices connected to a plurality of AC systems, respectively. The power conversion devices are further connected to a common DC circuit. The power conversion system further includes a start-up device to start up each power conversion device. The start-up device selects an AC system that satisfies a defined...