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Pat. 11219097 United States, Int. Cl.22 H05B 1/02, E21B 36/04, F16L 53/38, F16S 5/00, H02M 5/04, H05B 3/42. Subsea direct electrical heating power supply system, direct electrical heating system and method of operating a subsea direct electrical heating power supply system : Appl. N 16/430653 : Filed 04.06.2019 : Pub. 04.01.2022 : / Aravinda Perera ; Assignee Siemens Energy As ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11219097/en?oq=US11219097.html (дата обращения: ДД.ММ.ГГГГ).