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Pat. 11136985 United States, Int. Cl.22 H02M 3/28, E21B 43/12, F04D 15/00, G01R 31/50, H01F 27/28, H01F 30/06, H02M 1/12. High frequency AC noise suppression within transformers : Appl. N 16/558102 : Filed 31.08.2019 : Pub. 05.10.2021 : / Blayne Prine, Gordon Besser, Gary Williams, Craig Cooper, Vernon Chronister, Jeremy Hillshafer ; Assignee Baker Hughes Ltd, Baker Hughes Holdings LLC, Baker Hughes Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11136985/en?oq=US11136985.html (дата обращения: ДД.ММ.ГГГГ).