ALEXANDRIA, Va., March 3 -- United States Patent no. 12,567,812, issued on March 3, was assigned to KYOSAN ELECTRIC MFG. Co. LTD. (Yokohama, Japan).

"High-frequency power supply device and output control method therefor" was invented by Hiroshi Kunitama (Yokohama, Japan), Kunihiro Muto (Yokohama, Japan), Takuya Yoshida (Yokohama, Japan) and Koichi Miyazaki (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-frequency power supply device is provided with an AC-DC converter for converting an input from a three-phase alternating-current source into a direct current and a high-frequency amplifier including multiple FET elements and outputting a high-frequency alternating-current power, with th...