ALEXANDRIA, Va., July 30 -- United States Patent no. 12,374,474, issued on July 29, was assigned to Hitachi Energy Ltd (Zurich, Switzerland).
"Wall bushing" was invented by Anders Eriksson (Ludvika, Sweden), Alejandra Ravanal (Uppsala, Sweden) and Christos Athanasopoulos (Borlange, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wall bushing for high voltage application is presented. The wall bushing includes a grounded shield. The grounded shield includes a grading ring in a distal end thereof. The grading ring has an elliptic cross section with conjugate diameters, wherein a major diameter of the conjugate diameters is arranged in an axial direction of the grounded shield and a minor diameter of th...