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Pat. 9948140 United States, Int. Cl.22 H02J 15/00, B60L 1/04, B60L 3/00, B60L 8/00, B60L 11/18, B60L 15/00, B60T 1/10, B60T 13/58, B61H 9/06, H02J 3/00, H02M 7/06, H02M 7/217. High efficiency control system for the conversion of electrical energy to thermal energy : Appl. N 14/394323 : Filed 12.04.2013 : Pub. 17.04.2018 : / Anton Pietsch, George Lynch, Stephen B. Sutherland ; Assignee Kelvin Thermal Energy Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9948140/en?oq=US9948140.html (дата обращения: ДД.ММ.ГГГГ).