ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,444,559, issued on Oct. 14, was assigned to ABB Schweiz AG (Baden, Switzerland) and ABB S.p.A. (Milan).
"Medium voltage switching apparatus" was invented by Pierluigi Invernizzi (Corna Imagna, Italy) and Pierino Bertolotto (Bergamo, Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "A switching apparatus including one or more electric poles. For each electric pole, the switching apparatus includes a first pole terminal, a second pole terminal, a ground terminal, and a plurality of fixed contacts spaced apart one from another. For each electric pole, the switching apparatus further includes a movable contact and a vacuum interrupter. The vacuum interru...