ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,431,687, issued on Sept. 30, was assigned to Raytheon Co. (Arlington, Va.).

"Multi-octave spanning millimeter wave source with phase memory" was invented by Paul T. Hartin (McKinney, Texas), Kalin Spariosu (El Segundo, Calif.) and Michael R. Patrizi (Marlborough, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A synthesizer including a controller configured to receive a first signal. A digital-to-analog converter (DAC) is coupled to the controller and is configured to generate a voltage bias based on the first signal. The voltage bias corresponds to a target resonant frequency. A semiconductor laser is coupled to the DAC and is configured to recei...