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Pat. 9991779 United States, Int. Cl.22 H01F 27/42, H01F 37/00, H01F 38/00, H02J 7/02, H02J 50/12, H02J 50/70, H02M 1/12, H02M 3/335. Harmonic reduction apparatus for wireless power transfer systems : Appl. N 14/590908 : Filed 06.01.2015 : Pub. 05.06.2018 : / Hengchun Mao ; Assignee Nuvolta Technologies Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9991779/en?oq=US9991779.html (дата обращения: ДД.ММ.ГГГГ).