ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,489,311, issued on Dec. 2.
"Standby power cut-off device" was invented by Byongho Kim (Busan, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A standby power cut-off device installed on a power line connecting an external commercial alternating current power and the inside of an electrical device comprises: a manual switch for supplying the commercial alternating current power or cutting off the supply of same; a solid-state relay for supplying the commercial alternating current power to an output side when current flows through an input side according to the operation of the manual switch; a low power supply unit for converting voltage of the...