ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,483,028, issued on Nov. 25, was assigned to KEBODA TECHNOLOGY Co. LTD (Shanghai).

"Protective circuit capable of preventing error voltage access" was invented by Cai Yang (Shanghai) and Yuping Kan (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A protective circuit capable of preventing error voltage access, comprising a first unidirectional conduction element, a triode control circuit, a first triode, a first capacitor, a Darlington transistor, a first resistor, a second resistor, and a relay. A contact of the relay is connected in series between an input end and an output end. The first unidirectional conduction element has a first end connec...