ALEXANDRIA, Va., June 4 -- United States Patent no. 12,321,138, issued on June 3, was assigned to TEKNOLOGIAN TUTKIMUSKESKUS VTT OY (Espoo, Finland).
"High-frequency reference device" was invented by Vladimir Ermolov (Vtt, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A frequency reference device comprising a waveguide with a first end and a second end, a signal transmitter module for generating a high-frequency electromagnetic wave in the waveguide, and a signal receiver module for receiving the high-frequency electromagnetic wave in the waveguide. The component comprises a sealed enclosure, and said sealed enclosure is filled with a gas. The waveguide, first and second radiation coupling probes an...