ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,776,621, issued on Oct. 27, was assigned to SHANGHAI LAMSHINE Co. LTD (Shanghai).

"Green laser phase rangefinder and ranging method" was invented by Zhi Gong (Shanghai), Kai Dong (Shanghai) and Bangqi Chen (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a green laser phase rangefinder and a ranging method, which relate to the field of laser ranging. The rangefinder includes a direct digital synthesizer (DDS), a frequency mixing filter circuit, a microcontroller unit (MCU), a first amplifier circuit, an analog switch, a first laser beam module, a second laser beam module, a second amplifier circuit, an avalanche photodiode, a third...