ALEXANDRIA, Va., March 19 -- United States Patent no. 12,256,177, issued on March 18, was assigned to Alarm.com Inc. (Tysons, Va.).
"Batteryless video doorbell" was invented by Seton Paul Kasmir (San Diego).
According to the abstract* released by the U.S. Patent & Trademark Office: "A circuit is described for powering a video doorbell in signal communication with a chime that outputs audio. The circuit includes a switch coupled to a set of input power wires that supply power to the circuit from a source. The switch is operable to switch between: i) a first path of the circuit that supplies power to the video doorbell using the input power wires and ii) a second path of the circuit that supplies power to the chime using the input power wir...