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Pat. 10858911 United States, Int. Cl.22 H02M 7/68, E21B 41/00, E21B 47/12, H02M 5/293, H02M 5/22, H02M 5/297, H02M 7/5387. Bidirectional chopping of high voltage power in high temperature downhole tools to reduce tool size : Appl. N 14/845693 : Filed 04.09.2015 : Pub. 08.12.2020 : / Saurabh Kulkarni ; Assignee Baker Hughes Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10858911/en?oq=US10858911.html (дата обращения: ДД.ММ.ГГГГ).