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Pat. 10879731 United States, Int. Cl.22 H02J 9/00, H02J 9/06, H02M 1/10, H02M 5/12, H02M 7/44. Ferroresonant transformer systems and methods with selectable input and output voltages for use in uninterruptible power supplies : Appl. N 16/539286 : Filed 13.08.2019 : Pub. 29.12.2020 : / Thanh Quoc Le, Pankaj H. Bhatt, Thomas Patrick Newberry ; Assignee Alpha Technologies Services Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10879731/en?oq=US10879731.html (дата обращения: ДД.ММ.ГГГГ).