ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,039, issued on April 29, was assigned to DAIHEN Corp. (Osaka, Japan).

"High-frequency power supply system" was invented by Yuya Ueno (Osaka, Japan) and Yuichi Hasegawa (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-frequency power supply system according to the present disclosure includes a first power supply, a second power supply, a first matcher, and a second matcher. The second power supply performs pulse modulation of repeating an ON operation of outputting a second forward wave voltage and an OFF operation of not outputting the second forward wave voltage. The first power supply performs frequency modulation control in a se...