ALEXANDRIA, Va., March 12 -- United States Patent no. 12,249,846, issued on March 11, was assigned to UT-BATTELLE LLC (Oak Ridge, Tenn.).

"Polyphase wireless power transfer systems, coil assemblies and resonant networks" was invented by Jason L. Pries (Oak Ridge, Tenn.), Veda Prakash Galigekere (Oak Ridge, Tenn.) and Gui-Jia Su (Oak Ridge, Tenn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Polyphase wireless power transfer systems are provided. The transfer system may be used for charging hybrid and electric vehicles. The systems are capable of transferring over 50 KW over an air gap of 15 cm. The systems use a rotating magnetic field to transfer power. The system may comprise transmitter coil assembly. Th...