ALEXANDRIA, Va., June 16 -- United States Patent no. 12,308,187, issued on May 20, was assigned to Hitachi Energy Ltd (Zurich, Switzerland).

"System for controlling a vacuum interrupter for a power diverter switch, a power diverter switch and an on-load tap changer" was invented by Georgi Manev (Sofia, Bulgaria), Todor Kokev (Sofia, Bulgaria) and Borislav Vasilev (Sofia, Bulgaria).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system for controlling a vacuum interrupter for a power diverter switch comprises a main driving shaft which is configured to drive the control cam. The system further comprises the vacuum interrupter which is configured to separate electrical contacts in a vacuum by use of a contact ...