ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,548,721, issued on Feb. 10, was assigned to Mitsubishi Electric Corp. (Tokyo).
"Vacuum circuit breaker" was invented by Masashi Ueda (Tokyo) and Yasunori Nakamura (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum circuit breaker includes a grounded tank in which an insulating gas is sealed, a vacuum valve, a movable-side electrode, a fixed-side electrode, a bellows fixed to the movable-side electrode allowed to pass therethrough, to expand contract in the vacuum valve, a pressure valve regulating gas pressure between a first area enclosed by the bellows and a movable-side frame and a second area enclosed by the grounded tank outside the fir...